Abstract: A fingerprint sensor embedded in a flat-panel display includes photo sensors; select transistors that are correspondingly connected in series with the photo sensors respectively; switch transistors that are correspondingly connected in series with the select transistors respectively, but are correspondingly connected in parallel with the photo sensors respectively; and a detection circuit that detects a signal passing one turned-on select transistor.

Abstract: A driving method for reducing EMI of a touch display panel is provided. The touch display panel includes a common electrode layer. The driving method includes: applying a direct current (DC) voltage to the common electrode layer during a display period of the touch display panel; and applying a touch sensing signal to the common electrode layer during a touch sensing period of the touch display panel. The waveform of the touch sensing signal is a triangle wave, a sine wave, or the sine wave truncated by a window function.

Abstract: The present invention provides a touch panel and a controlling method thereof. The controlling method comprises: during a display period of the touch panel, turning on a bias voltage generation circuit to generate a bias voltage signal, turning on a reverse bias voltage generation circuit to generate a reverse bias voltage signal, and turning off a modulating voltage generation circuit; during a touch period of the touch panel, turning off the bias voltage generation circuit, the reverse bias voltage generation circuit and turning on the modulating voltage generation circuit to generate a modulating voltage signal, wherein the modulating voltage signal is same as a touch sensing signal of the touch panel; using a first capacitor to couple the modulating voltage signal to the bias voltage generation circuit; and using a second capacitor to couple the modulating voltage signal to the reverse bias voltage generation circuit.

Abstract: A display panel and an associated electronic device are provided. The display panel may include: a plurality of display blocks arranged to display images, a plurality of light sensors arranged to perform light sensing, a plurality of sets of switches, and a detection circuit. The plurality of sets of switches may combine the plurality of light sensors into a plurality of combined sensors, respectively, wherein the plurality of sets of switches operate according to a plurality of switching signals, respectively. The detection circuit may be coupled to two sets of combined sensors within the plurality of combined sensors, and arranged to detect a voltage level of a combined sensor of one set of the two sets of combined sensors according to a reference voltage level, for performing fingerprint detection through the display panel, wherein the reference voltage level is obtained from another set of the two sets of combined sensors.

Abstract: A display device is provided. The display device includes a display panel having a biometric detecting area configured to detect a biometric pattern of a biometric object in a blanking period of the display device. The biometric detecting area has plural blocks and each of the blocks comprises plural first pixels and plural photodetectors adjacent to the first pixels, respectively. The light sequentially penetrates the first pixels within each of the blocks in the blanking period of the display device.

Abstract: An electronic device control method applied to an electronic device can operate in a display mode and a touch sensing mode. The method comprises: (a) controlling the electronic device to have a first mode switch frequency; and (b) controlling the electronic device to have a second mode switch frequency different from the first mode switch frequency. The first mode switch frequency and the second mode switch frequency are frequencies for switching between the display mode and the touch sensing mode.

Abstract: A touch display apparatus is provided, which includes a panel and a circuit. The panel is configured for display, active stylus sensing and touch sensing, which includes a sensing layer having sensing blocks arranged in an array of rows and columns. The circuit is coupled to the panel, and is configured to drive the panel to perform display and active stylus sensing with respect to a first reference voltage at a first stage of a frame period and to drive the panel to perform touch sensing with respect to a second reference voltage at a second stage of the frame period.

Abstract: A touch display driving apparatus and an operation method thereof are provided. A display frame period is divided into a plurality of display driving periods and a plurality of touch driving periods. During the display driving periods, the display driver circuit drives a touch display panel. During the touch driving periods, the touch driver circuit detects common electrode rows of the touch display panel. The common electrode rows are parallel to a plurality of gate lines of the touch display panel. Each of the common electrode rows serves as a current common electrode row, wherein the current common electrode row covers a plurality of corresponding gate lines of the gate lines. The touch driving period during which the current common electrode row being detected is not temporally adjacent to the display driving period during which the corresponding gate lines being driven.

Abstract: An optical fingerprint detecting system includes a detection circuit with a differential pair of two inputs including a first input and a second input; a plurality of first photo detectors; a plurality of first switches that are electrically connected at first ends to the first photo detectors respectively, and are electrically connected at second ends together to the first input of the detection circuit via a sense line; and a plurality of second switches that are electrically connected at first ends together to the second input of the detection circuit via a reference line.

Abstract: A charge-pump circuit includes a clock generator that generates a clock signal; a sensing waveform generator that generates a sensing signal; a first diode having a cathode electrically connected to a predetermined low voltage; a first capacitor having a first plate electrically coupled to receive the clock signal, and a second plate electrically connected to an anode of the first diode; a second diode having a cathode electrically connected to the second plate of the first capacitor; and a second capacitor having a first plate electrically coupled to receive the sensing signal, and a second plate electrically connected to an anode of the second diode at an output node. The clock signal being generated in a charge-pump period alternates in time with the sensing signal being generated in a touch-sensing period.

Abstract: The present invention provides a touch panel and a controlling method thereof. The controlling method comprises: during a display period of the touch panel, turning on a bias voltage generation circuit to generate a bias voltage signal, turning on a reverse bias voltage generation circuit to generate a reverse bias voltage signal, turning on a positive voltage generation circuit to generate a positive voltage signal, turning on a negative voltage generation circuit to generate a negative voltage signal, and turning off a modulating voltage generation circuit; during a touch period of the touch panel, turning off the bias voltage generation circuit, the reverse bias voltage generation circuit, the positive voltage generation circuit, and the negative voltage generation circuit, and turning on the modulating voltage generation circuit to generate a modulating voltage signal, wherein the modulating voltage signal is same as a touch sensing signal of the touch panel.

Abstract: A position input system includes a touch screen, an active stylus and a driver. The driver transmits an uplink signal to the active stylus via the touch screen in a current touch period, the uplink signal containing timing information that informs the active stylus of timing of a next touch period in which the active stylus transmits a downlink signal to the driver via the touch screen. In another embodiment, the driver transmits an uplink signal to the active stylus via the touch screen in a current touch period of a current frame at a time different from a corresponding touch period of a previous frame.

Abstract: The present invention provides an in-cell touch panel sensing system and a sensing method. The in-cell touch panel sensing system comprises sensing arrays. Each sensing array comprises: sensor plates; a first multiplexer (MUX), a first analog-to-digital converter (ADC), a second MUX, a second ADC, a third MUX, a third ADC, a fourth MUX, and a fourth ADC. The first MUX is coupled to a first row of the sensor plates and a first column of the sensor plates. The first ADC is coupled to the first MUX. The second MUX is coupled to a second row of the sensor plates and a second column of the sensor plates. The third MUX is coupled to a third row of the sensor plates and a third column of the sensor plates. The fourth MUX is coupled to a fourth row of the sensor plates and a fourth column of the sensor plates.

Abstract: A touch apparatus and a sensing method and a touch sensing circuit thereof are provided. The touch apparatus includes a touch panel and the touch sensing circuit. In a first period, the touch sensing circuit applies the same driving signal to a plurality of sensing electrodes of the touch panel at the same time, and performs self-capacitance touch detection on the sensing electrodes to obtain a self-capacitance detection result. In a second period, the touch sensing circuit performs mutual-capacitance touch detection on at least one of the sensing electrodes to obtain a mutual-capacitance detection result. The touch sensing circuit determines whether a touch event of the touch panel is triggered by water based on the mutual-capacitance detection result and the self-capacitance detection result.

Abstract: An electrical device is provided and includes a touch electrode and a receiving circuit. The receiving circuit includes a first demodulator, a first analog to digital converter, a second demodulator, and a second analog to digital converter. The first demodulator is coupled to the touch electrode and demodulates a touch signal received from the touch electrode according to a first frequency to generate a first analog signal. The first analog to digital converter is coupled to the first demodulator and converts the first analog signal into a first digital signal. The second demodulator is coupled to the touch electrode and demodulates the touch signal according to a second frequency to generate a second analog signal. The second frequency is different from the first frequency. The second analog to digital converter is coupled to the second demodulator and converts the second analog signal into a second digital signal.

Abstract: An active stylus, a touch sensor, and a signal transmission and sensing method are provided. The active stylus comprises: an integrated circuit (IC) and a transmitting circuit. The IC comprises: a first modulator, a second modulator, and a mixer. The first modulator is utilized for modulating a first signal with a first frequency to generate a first frequency modulated signal. The second modulator is utilized for modulating a second signal with a second frequency to generate a second frequency modulated signal. The mixer is coupled to the first modulator and the second modulator, and utilized for mixing the first frequency modulated signal and the second frequency modulated signal to generate a mixed signal having the first frequency and the second frequency. The transmitting circuit is coupled to the IC, and utilized for transmitting the mixed signal to the touch sensor.

Abstract: The present invention provides a touch panel and a controlling method thereof. The controlling method comprises: during a display period of the touch panel, turning on a bias voltage generation circuit to generate a bias voltage signal, turning on a reverse bias voltage generation circuit to generate a reverse bias voltage signal, turning on a positive voltage generation circuit to generate a positive voltage signal, turning on a negative voltage generation circuit to generate a negative voltage signal, and turning off a modulating voltage generation circuit; during a touch period of the touch panel, turning off the bias voltage generation circuit, the reverse bias voltage generation circuit, the positive voltage generation circuit, and the negative voltage generation circuit, and turning on the modulating voltage generation circuit to generate a modulating voltage signal, wherein the modulating voltage signal is same as a touch sensing signal of the touch panel.

Abstract: An electronic apparatus is provided. The electronic apparatus includes a first integrated circuit (IC) and a second IC. The direction pin of the first IC outputs a direction control signal to the direction pin of the second IC. The first IC takes a control right when the direction control signal is in a first logic state. The clock pin of the first IC outputs a first clock signal to the clock pin of the second IC when the first IC takes the control right. The second IC takes the control right when the direction control signal is in a second logic state. The clock pin of the second IC outputs a second clock signal to the clock pin of the first IC when the second IC takes the control right.

Abstract: The fingerprint sensing circuit includes sensing units and a sensing circuit. The sensing units are arranged as columns and rows. Each of the sensing units includes a sensing electrode. The sensing circuit is electrically connected to the sensing electrodes in at least two first sensing units of the sensing units in a first period to obtain a first fingerprint grey level.

Abstract: A capacitor sensor apparatus and a sensing method thereof are provided. Oscillation signals with different frequencies are provided to a driving circuit and a mixer separately. The mixer mixes the oscillation signal with a lower frequency with a band-pass filtered signal. A band-pass filtering operation for generating the band-pass filtered signal is performed on a sensing signal before the mixer performs the mixing operation.