Novatek Microelectronics Corp.

Chih-Yuan Chang

He-Wei Huang

Hui-Hung Chang

Chun-Hung Chen

Chih-Chang Lai

Feng-Lin Chan

Tsung-Yin Yu

Ting-Hsuan Hung

Chih-Peng Hsia

Hung-Kai Chen

Guan-Ying Huang

Yu-Te Liao

Wei Cheng Liu

Pseudo resistor having an auto-tune function automatically calibrates resistance of the pseudo resistor and compensates for DC drift based on an output signal of an electrical circuit to which the pseudo resistor is coupled, as to mitigate signal phenomenon in the output signal caused by PVT variation. The pseudo resistor includes first transistor, second transistor, and adder. The first terminal of the second transistor is coupled to the first terminal of the first transistor and forms a first common node. The control terminal of the first transistor is coupled to the control terminal of the second transistor and forms second common node. The adder is coupled between the first and second common nodes and configured to receive adjustment voltage for generating a bias voltage for controlling the first and second transistors, where the adjustment voltage corresponds to the output signal coupled to the second terminal of the second transistor.

Pseudo resistor with autotune function

A sensor system includes a sensing panel, at least one multiplexer and a controller. The sensing panel includes one or more sensing areas. The multiplexer is coupled to the one or more sensing areas through one or more connecting wire groups on the sensing panel, wherein each of the connecting wire groups includes one or more connecting wires. The controller is coupled to the at least one multiplexer via one or more control wires and one or more sensing wires. Each of the at least one multiplexer includes one or more switch groups each coupled between one of the one or more sensing wires and one of the connecting wire groups, and each of the switch groups includes one or more switches respectively controlled by one or more control signals transmitted through the one or more control wires.

Sensor device and system and related controller, multiplexer and panel apparatus

A fingerprint detecting system comprises a fingerprint module, for receiving a fingerprint driving signal and performing a frequency modulation on the fingerprint driving signal, to correspondingly outputting a fingerprint signal with a first frequency based on the fingerprint driving signal, and a signal processing circuit, coupled to the fingerprint module, for receiving the fingerprint signal with the first frequency, performing a frequency demodulation to shift the first frequency of the fingerprint signal to a second frequency, and filtering the fingerprint signal with the second frequency based on the first frequency, whereby the filtered fingerprint signal is used for a fingerprint data analysis.

Fingerprint detecting system and related method

A switched capacitor circuit includes an output capacitor, a first transmission switch, a first reference buffer, a second transmission switch, a second reference buffer and a charge compensation circuit. The output capacitor includes a first terminal and a second terminal, wherein the first terminal is coupled to an output terminal of the switched capacitor circuit, and the second terminal is coupled to a reference node. The first transmission switch is coupled to the reference node. The first reference buffer is coupled to the first transmission switch. The second transmission switch is coupled to the reference node. The second reference buffer is coupled to the second transmission switch. The charge compensation circuit is coupled to the reference node.

Switched capacitor circuit and capacitive DAC

A sensing circuit of a display device is provided. The sensing circuit includes a chopper circuit, a first operational amplifier and a filter. The chopper circuit is configured to receive a sensing input signal of the display device and modulate the sensing input signal. The first operational amplifier is coupled to the chopper circuit. The first operational amplifier is configured to receive the modulated sensing input signal and output the modulated sensing input signal to the chopper circuit. The chopper circuit is further configured to demodulate the modulated sensing input signal from the first operational amplifier and output the demodulated sensing input signal. The filter is coupled to the chopper circuit. The filter is configured to filter the demodulated sensing input signal from the chopper circuit and output the filtered sensing input signal as a sensing output signal. A source driver including the sensing circuit is also provided.

Sensing circuit and a source driver of a display device

A touch sensor system includes a touch panel, at least one multiplexer and a touch controller. The touch panel includes one or more touch sensing areas. The at least one multiplexer is coupled to the one or more touch sensing areas through one or more connecting wire groups on the touch panel, wherein each of the connecting wire groups includes one or more connecting wires. The touch controller is coupled to the at least one multiplexer via one or more touch control wires and one or more touch sensing wires. Each of the at least one multiplexer includes one or more switch groups each coupled between one of the one or more touch sensing wires and one of the connecting wire groups, and each of the switch groups includes one or more switches respectively controlled by one or more control signals transmitted through the one or more touch control wires.

Touch sensor system and multiplexer thereof

A touch sensor system includes a touch panel having a plurality of touch sensing areas, at least one multiplexer and a touch controller. The touch controller, for controlling touch driving and sensing on the touch panel, includes a plurality of pins connected to the multiplexer via a plurality of touch control wires and touch sensing wires, wherein each of the pins is connected to one of the touch control wires or touch sensing wires. Each of the touch sensing wires transmits driving signals from the touch controller to a corresponding multiplexer to perform driving on one of the touch sensing areas, and transmits sensing signals from the touch sensing area to the touch controller. The touch controller controls the multiplexer to perform touch driving and sensing on the touch sensing areas in a specific order by triggering the touch control wires in an order.

A capacitance measurement device for measuring the capacitance of a measured capacitor includes a charging control unit for charging the measured capacitor; a discharging control unit for discharging the measured capacitor; a voltage converting circuit coupled to the measured capacitor, for converting a voltage signal on the measured capacitor into a value that represents the capacitance of the measured capacitor; wherein in a first period, one of the charging control unit and the discharge control unit charges/discharges the measured capacitor and in a second period after the first period, the other one of the charging control unit and the discharge control unit discharges/charges the measured capacitor.

Capacitance measurement device and electronic device thereof

A touch control detection system, a delta-sigma modulator and a modulating method thereof are provided. The delta-sigma modulator includes a quantizer and N integrating units. The quantizer generates a modulating result signal. The integrating units are coupled in series. Each of the integrating receives an input signal, and each of the integrating units receives a plurality of gain parameters, N is a positive integer. The quantizer quantizes a signal on an output end of the Nstage integrating unit according to an error signal for generating the modulating result signal. A center frequency of a noise transfer function (NTF) of the delta-sigma modulator is adjusted according to the gain parameters, and the gain parameters are determined according to a frequency of the input signal.

Touch control detection system, delta-sigma modulator and modulating method thereof

A touching apparatus and a touching detecting method thereof are provided. The touching detecting method is adapted for a touch panel. The touch panel has a plurality of touching rows and a plurality of touching columns. The touching detecting method includes: performing a mutual-capacitor touching detection and a self-capacitor touching detection alternatingly to the touch panel for obtaining a mutual-capacitor detection result and a self-capacitor detection result, respectively; and obtaining position information of at least one touch point on the touch panel by an operation based on the mutual-capacitor detection result and the self-capacitor detection result.

Touching apparatus and touching detecting method thereof

An energy-efficient touch panel control device includes a touch panel, a buffer memory, an analog to digital conversion unit, for converting analog output voltage to digital trace data and storing the digital trace data in the buffer memory, and according to a control signal, switching an operating mode, an operation unit, generating a detecting result according to the digital trace data, switching the operating mode according to an interrupt signal, and including a mode control unit, for generating the control signal according to the interrupt signal, and a host interface unit.

Energy-efficient touch panel device and related method

A touch detection method for a touch control device including a touch panel includes examining whether a charging capacity for charging a measured capacitor of the touch panel and a discharging capacity for discharging the measured capacitor are determined; charging and discharging the measured capacitor by using the charging capacity and the discharging capacity when the charging capacity and the discharging capacity are determined and receiving a count value representing the capacitance of the measured capacitor, examining whether a base count value is set, calculating a difference between the count value and the base count value when the base count value is set, for determining whether the touch panel is touched, examining whether the count value is in a predetermined range, and performing a charging and discharging capacity setting process when the count value is out of the predetermined range, for adjusting the charging capacity and the discharging capacity.

Touch detection method and related touch control device

A capacitance measurement device includes a charging control unit for charging a measured capacitor, a discharging control unit for discharging the measured capacitor, a first switch coupled to the measured capacitor and the charging control unit for controlling a connection between the measured capacitor and the charging control unit according to a first switching signal, a second switch coupled to the measured capacitor and the discharging control unit for controlling a connection between the measured capacitor and the discharging control unit according to a second switching signal, a first A/D converter coupled to the measured capacitor for converting a voltage signal on the measured capacitor into a first signal, and a duty cycle detecting circuit coupled to the measured capacitor for converting the voltage signal on the measured capacitor into a count value that represents the capacitance of the measured capacitor and outputting the count value to a processing unit.

Capacitance measurement device for a touch control device

A power sequence control circuit receives an input positive voltage and an input negative voltage. The control circuit includes a pull-up stage, having a first terminal receiving the input positive voltage, a second terminal coupled to a node, and a control terminal receiving feedback of an output positive voltage. A pull-down stage has a first terminal coupled to the node and a second terminal coupled to an output negative voltage. A current-limit switching unit has a first terminal receiving the input positive voltage, a second terminal outputting the output positive voltage, and a control terminal coupled to the node. When the output negative voltage decreases, and if the pull-down stage decreases a control voltage at the node and the control voltage is less than a threshold value, the current-limit switching unit is conducted to transmit the input positive voltage as the output positive voltage.

Power sequence control circuit, and gate driver and LCD panel having the same

A method of detecting a touch event for a touch panel which comprises a plurality of intersecting traces. The method includes outputting a charge control signal to a trace of the plurality of traces, and keeping other traces except for the trace floating and determining whether the touch event happens according to a voltage signal on the trace.

Growing community of inventors

Hsinchu County, Taiwan

Chih-Yuan Chang