Abstract: An optical sensor is disclosed. Each sensor pixel circuit of the optical sensor includes a first readout TFT for reading out voltage of a charge node, a second readout TFT for controllably resetting the charge node to a first reset voltage, and a photo TFT for discharging the voltage at the charge node to a second reset voltage in absence of an object(s).

Abstract: A reset circuit and a delay circuit are provided. The delay circuit includes a first resistor module, a second resistor module, a switch module and a capacitor module. First terminals of the first and the second resistor modules are coupled respectively to a first voltage and a second voltage. The switch module have a control terminal served as a input terminal of the delay circuit, a first terminal served as a output terminal of the delay circuit, a second terminal coupled to a second terminal of the first resistor module, and a third terminal coupled to a second terminal of the second resistor module. In the delay circuit, the first terminal selectively connected to the second terminal or the third terminal in accordance with the control terminal. The capacitor module couples between the first terminal of the switch module and the second voltage.

Abstract: A multi-channel integrator is provided. The multi-channel integrator includes an integrator and a plurality of channels. Each of the channels includes an input selector and a unit-gain amplifier. The input selector has a common terminal, a first selecting terminal and a second selecting terminal. The input selector selectively electrically connects the common terminal to the first selecting terminal or to the second selecting terminal. The first selecting terminal of the input selector is coupled to an input terminal of the integrator. An input terminal of the unit-gain amplifier is coupled to the second selecting terminal of the input selector.

Abstract: A readout apparatus and a multi-channel readout apparatus for a touch panel are provided to integrate different types of readout circuit. The readout apparatus set to a first mode reads the touch panel with a small amount of charges through an integrator. The readout apparatus set to a second mode reads a sensing current of a current type touch panel through a current to voltage converting unit and an inverting amplifier, so as to save a chip area. The multi-channel readout apparatus set to a third mode applies multiple channels to alternatively share an integrator to read the touch panel with a large amount of charges, so that an amount of feedback capacitors (integral capacitors) having a great area can be greatly reduced. Therefore, readout apparatus of the present invention can not only reduce a chip area, but can also be applied to various types of the touch panel.

Abstract: A readout apparatus for a current type touch panel is provided. The readout apparatus includes a current-to-voltage converter, a voltage gain unit and an analog-to-digital converter (ADC). The current-to-voltage converter converts a sensing current of the current type touch panel to a sensing voltage. An input end of the voltage gain unit is coupled to an output end of the current-to-voltage converter for receiving the sensing voltage. An input end of the ADC is coupled to an output end of the voltage gain unit. An output end of the ADC generates a digital code.

Abstract: A multi-channel integrator includes a first switch, a second switch, and a plurality of integration units. First terminals of the first and second switches receive a first reference voltage. Each of the integration units includes an operational amplifier (OP-AMP), a feedback switch, a third switch, a fourth switch, and a feedback capacitor. A second input terminal of the OP-AMP receives a second reference voltage. Two terminals of the feedback switch are respectively coupled to a first input terminal and an output terminal of the OP-AMP. First terminals of the third switch and the fourth switch are respectively coupled to the first input terminal and the output terminal of the OP-AMP. A first terminal of the feedback capacitor is coupled to the second terminals of the first and the third switches. A second terminal of the feedback capacitor is coupled to the second terminals of the second and the fourth switches.

Abstract: A readout circuit for touch panel includes first and second switches, an operational amplifier (OP-AMP), a feedback capacitor, a comparison unit, and a counter. A first input terminal and an output terminal of the OP-AMP are respectively coupled to a second terminal of the first switch and an input terminal of the comparison unit. A second input terminal of the OP-AMP receives a reference voltage. Two terminals of the feedback capacitor and the second switch are respectively coupled to the first input terminal and the output terminal of the OP-AMP. The comparison unit selects first or second threshold voltages to compare with an output of the OP-AMP according to a output of the comparison unit. An input terminal of the counter receives the output of the comparison unit.

Abstract: A capacitive fingerprint sensor comprises a fingerprint capacitor, a reference capacitor, a first transistor, a second transistor, a comparator and a multiplexer. The fingerprint capacitor has a capacitance that is either a valley capacitance CFV or a ridge capacitance CFR, wherein CFV is smaller than CFR. One end of the reference capacitor CS is connected to the fingerprint capacitor, and the other end is connected to a trigger signal, wherein the trigger signal is initiated only during a precharge phase. The first transistor is configured to control the fingerprint capacitor during a scan line period. The second transistor is configured to precharge the fingerprint and reference capacitors. One end of the comparator is connected to the second transistor. The multiplexer is connected to another input end of the comparator for providing a first voltage VA and a threshold voltage Vth.

Abstract: A capacitive fingerprint sensor comprises a first transistor, a second transistor, a fingerprint capacitor and a third transistor. The fingerprint capacitor has a capacitance that is either a valley capacitance CFV or a ridge capacitance CFR, wherein CFV is smaller than CFR. The first transistor is configured to precharge the fingerprint capacitor. The second transistor is configured to discharge the fingerprint capacitor toward a bias voltage VB. The third transistor is configured to output the voltage of the fingerprint capacitor after discharge.

Abstract: A capacitive fingerprint sensor comprises a fingerprint capacitor, an integrator, a first transistor, a second transistor and a multiplexer. The fingerprint capacitor has a capacitance that is either a valley capacitance CFV or a ridge capacitance CFR, wherein CFV is smaller than CFR. The integrator has a reference capacitor Cfb. The first transistor is configured to control the fingerprint capacitor during a scan line period. The second transistor is configured to precharge the fingerprint capacitor and to redistribute the charges between the fingerprint capacitor and the reference capacitor Cfb. The multiplexer is connected to the integrator for providing a first voltage VA and a second voltage VB, wherein the first voltage VA is greater than the second voltage VB.

Abstract: A capacitive fingerprint sensor comprises a fingerprint capacitor, a reference capacitor, a first transistor and a second transistor. The fingerprint capacitor CF has a capacitance that is either a valley capacitance CFV or a ridge capacitance CFR. The reference capacitor CS has a capacitance CS, and CFV<CS<CFR. The first transistor is configured to precharge the reference capacitor and the fingerprint capacitor during a precharge phase. The second transistor is configured to output the voltage of the reference capacitor during an evaluation phase. The precharge phase is controlled by a first readout select line, the evaluation phase is controlled by a second readout select line, the second readout select line is immediately next to the first readout select line, and the valid time to access the readout line is within an enabling period of the second readout select line.

Abstract: A capacitive fingerprint sensor comprises a fingerprint capacitor, an integrator, a first transistor, a second transistor and a third transistor. The fingerprint capacitor has a capacitance that is either a valley capacitance CFV or a ridge capacitance CFR, wherein CFV is smaller than CFR. The integrator has a reference capacitor Cfb. The first transistor is configured to control the fingerprint capacitor during a scan line period. The second transistor is configured to discharge the fingerprint capacitor. The third transistor is configured to precharge the fingerprint capacitor and to redistribute the charges between the fingerprint capacitor and the reference capacitor Cfb.

Abstract: A capacitive fingerprint sensor comprises a fingerprint capacitor, a reference capacitor, a first transistor, a second transistor, a third transistor and a fourth transistor. The fingerprint capacitor CF has a capacitance that is either a valley capacitance CFV or a ridge capacitance CFR. The reference capacitor CS has a capacitance CS, and CFV<CS<CFR. The first transistor is configured to precharge the reference capacitor. The second transistor is configured to precharge the fingerprint capacitor. The third transistor is configured to redistribute the charges of the reference capacitor and fingerprint capacitor. The fourth transistor is configured to output the voltage of the reference capacitor after redistribution.

Abstract: A source driver of an LCD includes a first and second power sources, a first and second inversion units, a first and second charging switches, and a first and second discharging switches. The first charging switch is coupled to the first power source, a first end of the first inversion unit, and a second end of the second inversion unit. The second charging switch is coupled to the first power source, a first end of the second inversion unit, and a second end of the first inversion unit. The first discharging switch is coupled to the second power source, the second end of the first inversion unit, and the first end of the second inversion unit. The second discharging switch is coupled to the second power source, the second end of the second inversion unit, and the first end of the first inversion unit.

Abstract: A capacitive fingerprint sensor comprises a first transistor, a second transistor, a fingerprint capacitor and a third transistor. The fingerprint capacitor has a capacitance that is either a valley capacitance CFV or a ridge capacitance CFR, wherein CFV is smaller than CFR. The first transistor is configured to precharge the fingerprint capacitor. The second transistor is configured to discharge the fingerprint capacitor toward a bias voltage VB. The third transistor is configured to output the voltage of the fingerprint capacitor after discharge.

Abstract: A capacitive fingerprint sensor comprises a fingerprint capacitor, a reference capacitor, a first transistor and a second transistor. The fingerprint capacitor CF has a capacitance that is either a valley capacitance CFV or a ridge capacitance CFR. The reference capacitor CS has a capacitance CS, and CFV<CS<CFR. The first transistor is configured to precharge the reference capacitor and the fingerprint capacitor during a precharge phase. The second transistor is configured to output the voltage of the reference capacitor during an evaluation phase. The precharge phase is controlled by a first readout select line, the evaluation phase is controlled by a second readout select line, the second readout select line is immediately next to the first readout select line, and the valid time to access the readout line is within an enabling period of the second readout select line.

Abstract: A capacitive fingerprint sensor comprises a fingerprint capacitor, an integrator, a first transistor, a second transistor and a third transistor. The fingerprint capacitor has a capacitance that is either a valley capacitance CFV or a ridge capacitance CFR, wherein CFV is smaller than CFR. The integrator has a reference capacitor Cfb. The first transistor is configured to control the fingerprint capacitor during a scan line period. The second transistor is configured to discharge the fingerprint capacitor. The third transistor is configured to precharge the fingerprint capacitor and to redistribute the charges between the fingerprint capacitor and the reference capacitor Cfb.

Abstract: A capacitive fingerprint sensor comprises a fingerprint capacitor, a reference capacitor, a first transistor, a second transistor, a comparator and a multiplexer. The fingerprint capacitor has a capacitance that is either a valley capacitance CFV or a ridge capacitance CFR, wherein CFV is smaller than CFR. One end of the reference capacitor CS is connected to the fingerprint capacitor, and the other end is connected to a trigger signal, wherein the trigger signal is initiated only during a precharge phase. The first transistor is configured to control the fingerprint capacitor during a scan line period. The second transistor is configured to precharge the fingerprint and reference capacitors. One end of the comparator is connected to the second transistor. The multiplexer is connected to another input end of the comparator for providing a first voltage VA and a threshold voltage Vth.

Abstract: A capacitive fingerprint sensor comprises a fingerprint capacitor, an integrator, a first transistor, a second transistor and a multiplexer. The fingerprint capacitor has a capacitance that is either a valley capacitance CFV or a ridge capacitance CFR, wherein CFV is smaller than CFR. The integrator has a reference capacitor Cfb. The first transistor is configured to control the fingerprint capacitor during a scan line period. The second transistor is configured to precharge the fingerprint capacitor and to redistribute the charges between the fingerprint capacitor and the reference capacitor Cfb. The multiplexer is connected to the integrator for providing a first voltage VA and a second voltage VB, wherein the first voltage VA is greater than the second voltage VB.

Abstract: A sensor pixel and a touch panel using the same are provided herein, wherein the touch panel has m scan lines and n readout lines. The sensor pixel includes a sensing capacitor, a readout transistor, a reset transistor, a base transistor, and a photo transistor. The photo transistor included in the sensor pixel produces a photo leakage current when it is exposed to a light. The light obstruction characteristic of the photo transistor is utilized to detect the locations of the touched sensor pixels. By proper timing control, the present invention not only can be applied to the multi-finger detection, but also is easy to be implemented.