Shenzhen Goodix Technology Co., Ltd.

Nuvoton Technology Corporation

Ya-Nan Wen

Yingsi Liang

Fu-Chiang Yang

Hsin-Jui Chou

Hong Jiang

Chung-Yi Wang

Yu-Cheng Chang

Po-Yuan Wang

Tzu-Li Hung

The application discloses a touch controller to determine a position where a user touches a touchscreen. The touchscreen includes a first transmitting electrode, a second transmitting electrode and a receiving electrode. The touch controller includes a signal generation module and a demodulation module. The signal generation module is configured to perform an in-phase code transmission at a first time so that the receiving electrode receives an in-phase code receiving signal correspondingly, and perform an inverting-phase code transmission at a second time so that the receiving electrode receives an inverting-phase code receiving signal correspondingly. The demodulation module is configured to determine the position where the user touches the touchscreen according to the in-phase code receiving signal corresponding to the first time and the inverting-phase code receiving signal corresponding to the second time.

Touch controller using simultaneously generated transmitting signals with different phases and associated chip, touch control system and touch control method

A noise sensing circuit is provided according to the disclosure. The noise sensing circuit includes a first filter, which is coupled to a plurality of receiving electrodes, and configured for receiving a plurality of reception signals corresponding to the plurality of receiving electrodes, and performing a high pass filtering operation or a band pass filtering operation on the plurality of reception signals to generate a filtering result; a down-sampling unit, which is coupled to the first filter, and configured for performing a down-sampling operation on the filtering result to generate a down-sampling result; and a noise detection unit, which is coupled to the down-sampling unit, and configured for determining a first operating frequency of the touch device according to the down-sampling result.

Noise sensing circuit and touch device

The present application provides a noise detection circuit, including: a mixing module, configured to perform a mixing operation based on a plurality of frequencies to an integrated signal, to generate a plurality of in-phase signals and a plurality of quadrature signals; a computing module, wherein when the touch control system uses the first frequency to perform the touch control, the computing module performs a signal cancellation operation to a first in-phase signal and a first quadrature signal to calculate and output a first output signal corresponding to the first frequency; and a determination module, configured to select a best output signal from the plurality of output signals and output a best frequency.

Noise detection circuit, noise detection method and detection circuit

The present disclosure is applied to touch technology, and provides an integrating circuit. The integrating circuit comprises an impedance unit, an amplifier, an integration capacitor, a discharge capacitor, a first switch and a second switch. The amplifier comprises a first input terminal, a second input terminal and an output terminal configured to output an output signal; the integration capacitor is coupled between the first input terminal and the output terminal; the first switch is coupled between the first input terminal of the amplifier and the second terminal of the discharge capacitor; and the second switch is coupled between the first terminal and the second terminal of the discharge capacitor.

Integrating circuit and capacitance sensing circuit

The present disclosure provides a mobile device. The mobile device includes a casing, configured to accommodate or support the mobile device; a thin touchscreen, including at least one driving electrode and at least one receiving electrode, wherein the driving electrode is configured to receive a driving signal, and the receiving electrode is configured to generate a sensing signal to sense a touch operation; a capacitive sensing system, including a sense circuit, coupled to the at least one receiving electrode and configured to generate the driving signal and receive the sensing signal to determine the touch operation; and a power supply unit, configured to output a supply voltage and a ground voltage; and an isolation module, configured to isolate the supply voltage from the ground voltage.

Capacitive sensing system and mobile device

The present application provides a non-orthogonal demodulation module, receiving a received signal and the received signal is related to a summation of a plurality of transmitted signals. The plurality of transmitted signals are corresponding to a plurality of frequencies, and the plurality of transmitted signals are not orthogonal to each other. The non-orthogonal demodulation module comprises a mixing-and-integrating unit, configured to perform mixing operations and integrating operations on the received signal respectively at the plurality of frequencies, to generate a plurality of in-phase components and a plurality of quadrature components corresponding to the plurality of frequencies; and a decoding unit, configured to generate at least a decoding matrix, and compute a plurality of energies corresponding to the plurality of transmitted signals according to the at least a decoding matrix, the plurality of in-phase components and the plurality of quadrature components.

Non-orthogonal demodulation module, touch system and non-orthogonal demodulation method

A touch controller () includes: a signal generating module (), coupled to a plurality of transmit electrodes (TE&#x2dc;TEM) of a touch panel, and is configured to output a first transmitting signal to a first transmit electrode (TEa) and simultaneously output a second transmitting signal to a second transmit electrode (TEb), wherein the first transmitting signal has a first phase, the second transmitting signal has a second phase; and a demodulating module (), coupled to a plurality of receive electrodes (RE&#x2dc;REN) of the touch panel, and is configured to calculate a first amplitude (A) corresponding to the first phase and a second amplitude (B) corresponding to the second phase of the receiving signal according to a receiving signal (RXn) of a receive electrode (REn) of the plurality of receive electrodes.

Touch controllers, demodulation methods and touch systems

The present disclosure provides a capacitance detection circuit, which includes a sense circuit coupled to a plurality of receive electrodes and configured to generate a plurality of sense results, the plurality of sense results being associated with capacitance between a plurality of transmit electrodes and the plurality of receive electrodes; and a first driving circuit coupled to the plurality of transmit electrodes; wherein when the first driving circuit keeps at least one first transmit electrode of the plurality of transmit electrodes floating, the first driving circuit generates at least one first driving signal and sends the least one first driving signal to at least one second transmit electrode of the plurality of transmit electrodes, to compensate a baseline current between the plurality of receive electrodes and a ground terminal.

Capacitance detection circuit and electronic device

A differential circuit is provided. The differential circuit comprises a plurality of electrodes comprising at least a middle electrode, wherein the middle electrode is directly adjacent to a first electrode and a second electrode of the plurality of electrodes; a plurality of amplifiers, coupled to the plurality of electrodes; and at least a buffer, coupled between the middle electrode and at least one amplifier of the plurality of amplifiers.

Differential circuit

The present disclosure provides a converting module formed in a first die. The first die is coupled to a bus having a bus bit width. The converting module includes an analog-to-digital converter, configured to generate a first digital signal having a first bit width different from the bus bit width; and a sigma-delta modulator, coupled to the analog-to-digital converter, and configured to generate a second digital signal according to the first digital signal. The second digital signal has a bit width equal to the bus bit width. The sigma-delta modulator includes a filter and a quantizer. The number of bits outputted by the quantizer is equal to the bus bit width.

Converting module and converting circuit

The present application provides a window function processing module including an integrating circuit, configured to receive an integrating input signal, the integrating circuit comprising an operational amplifier; an integrating capacitor, coupled to an output terminal and a first input terminal of the operational amplifier; and an adjustable impedance module, coupled between the first input terminal of the operational amplifier and an integrating input terminal of the integrating circuit, wherein the adjustable impedance module is controlled by at least one control signal to adjust an impedance value of the adjustable impedance module; and a control unit, coupled to the integrating circuit, configured to generate the at least one control signal according to a window function, to adjust the integration gain of the integrating circuit, such that the integrating output signal is related to an operation result of the integrating input signal and the window function.

Window function processing module

Disclosed is a pixel sensing circuit, which is in a fingerprint identification mode or a noise detection mode, and includes: a plurality of shielding layers, including a first-type shielding layer and a second-type shielding layer, the second shielding layer being coupled to a ground terminal; and a charging circuit, coupled to the capacitance sensing layer and the first-type shielding layer, and comprising a positive voltage generator configured to providing a positive voltage; wherein when the pixel sensing circuit is in a fingerprint identification mode, the charging circuit periodically provides the positive voltage for the capacitance sensing layer and the first-type shielding layer; or when the pixel sensing circuit is in the noise detection mode, the charging circuit cuts off connections between the positive voltage generator and the capacitance sensing layer and the first-type shielding layer, and periodically outputs a voltage of the capacitance sensing layer to a first output terminal.

Pixel sensing circuit for fingerprint identification, fingerprint identification system and electronic device thereof

A touch sensing method of charge distribution type is disclosed. Firstly, charges in a panel are removed. Next, a scanning signal is provided to scan a plurality of sensing regions of the panel. Subsequently, the panel is set in a first switching mode for charging the panel with the scanning signal. Thereafter, the panel is set in a second switching mode for modifying a distribution of charges injected into the panel. Next, an equivalent voltage is acquired after the charges are distributed at an equilibrium state. Furthermore, a touch sensing apparatus with charge distribution type is provided herein.

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Taipei, Taiwan

Ya-Nan Wen