Abstract: A method of detecting a touch point and a touch controller is disclosed. The method includes: a touch detection mode is determined according to a first result at an initial time of a detection period (S110), the first result being a touch detection result corresponding to an adjacent detection period prior to the detection period; and a touch point on a touch screen is detected in the touch detection mode (S120), where the touch detection mode includes a single-finger touch detection mode and a multi-finger touch detection mode. A method of detecting a touch point could achieve a balance between power consumption and response speed, and accordingly, improve user experience.

Abstract: Techniques are described for implementing reduced-noise pixel ramp voltage generators for image sensors. The described pixel ramp voltage generators include circuit blocks to address various conventional causes of ramp generator noise. For example, a reference current is generated. Current steering can be used to toggle between a ramp-run mode for generation of a ramp voltage, and a ramp-stop mode for stopping the generation, thereby mitigating changes in low-frequency noise components between pixel conversion cycles, or phases or such cycles. Buffer multiplier techniques can be used to isolate kickback noise of the pixel conversion comparators from components generating the ramp voltage, such as to mitigate image smearing. Some implementations include additional features, such as sample-and-hold techniques used to isolate ramp generation components from current generation component noise, slope calibration techniques to dynamically tune voltage ramp slope, reset techniques, etc.

Abstract: A readout circuit, an image sensor and an electronic device are provided, which could effectively reduce an area and power consumption of the image sensor. The readout circuit includes a plurality of capacitors, a switch circuit and an output circuit; where the plurality of capacitors are connected to the output circuit through the switch circuit; the plurality of capacitors are configured to store output signals of a plurality of pixel circuits, respectively; and the output circuit is configured to output signals stored by the plurality of capacitors through the switch circuit one-by-one.

Abstract: Some embodiments of the present disclosure provide a positive and negative voltage driving circuit. The positive and negative voltage driving circuit includes: a positive and negative voltage generating module and a control module. The positive and negative voltage generating module includes a switch module. The control module is configured to control a turn-off state and a turn-on state of the switch module to enable the positive and negative voltage generating module to output a positive voltage and a negative voltage to a stylus tip of an active stylus. The positive and negative voltage driving circuit of the embodiments of the present disclosure can significantly reduce the driving power consumption of the active stylus while ensuring driving effects.

Abstract: An under-screen biometric identification apparatus and electronic device. The under-screen biometric identification apparatus includes an optical function layer, including a first linear polarizer and a first quarter-wave plate, wherein the first linear polarizer and the first quarter-wave plate are configured to be stacked; a biometric identification module, configured to perform biometric identification based on light transmitted to the biometric identification module via the optical function layer. The under-screen biometric identification apparatus could improve the performance of the under-screen biometric identification.

Abstract: A fingerprint sensor, a fingerprint recognition module and a fingerprint recognition system. The fingerprint sensor includes: a sensor die configured to collect fingerprint information; a package structure configured to package the sensor die, where the sensor die or the package structure includes a first metal electrode, which is connected with a touch detection module, and the touch detection module is connected with a control module and is configured to feed back a touch signal to the control module, so as to enable the control module to supply power to the fingerprint sensor according to the touch signal, and then enable the sensor die to collect fingerprint information. Under the premise of ensuring low standby power consumption of the fingerprint recognition system, the anti-interference ability and the ESD performance of the fingerprint recognition module are improved, and the flexibility of the touch detection scheme is improved.

Abstract: A method for measuring a power-on reset time includes: detecting a power supply pin voltage of a chip, and recording a time point at which the power supply pin voltage reaches a preset voltage as a first time point; detecting an output signal of a preset pin of the chip, and recording a time point at which the preset pin completes a pulse output for a first time after the chip is powered on, as a second time point, and recording a time point the preset pin completes a pulse output for a second time, as a third time point; wherein widths of the pulse output for the first time and for the second time are the same; and computing the power-on reset time of the chip according to the first time point, the second time point and the third time point.

Abstract: A touch control chip, a coding method, and an electronic device are provided, which can effectively reduce influence of a coding signal of a touch control layer of a screen on a display layer. The touch control chip includes: a driving circuit configured to output the coding signal to a display layer of the screen; and a control circuit configured to adjust a driving impedance of the driving circuit during a period when the driving circuit outputs the coding signal, so that a value of the driving impedance in a display sensitive interval of the display layer is greater than a value of the driving impedance in a time interval outside the display sensitive interval, where the display sensitive interval includes a pixel update interval of the display layer, and the pixel update interval is the time interval for a pixel in the display layer to receive a data signal.

Abstract: The embodiments of the present application provide a fingerprint identification apparatus, which has a smaller thickness and a better imaging effect at the same time. The fingerprint identification apparatus includes: a light path directing structure disposed between a display screen and an optical fingerprint sensor for directing a light signal that is obliquely incident on a finger above the display screen at a preset angle and reflected by the finger to the optical fingerprint sensor; and the optical fingerprint sensor disposed below the light path directing structure for detecting the received light signal.

Abstract: Provided are a multi-sensor-based under-screen fingerprint capturing method and system and an electronic device, applied to an under-screen fingerprint capturing system including multiple fingerprint sensors, where the method includes: determining an effectively pressed fingerprint sensor among the multiple fingerprint sensors according to a pressing region of a user on a display screen, where each fingerprint sensor corresponds to a sensing region, and sensing regions corresponding to the multiple fingerprint sensors form a fingerprint capturing region of the under-screen fingerprint capturing system; controlling the effectively pressed fingerprint sensor to be in a working state and another fingerprint sensor other than the effectively pressed fingerprint sensor to be in a non-working state; and capturing fingerprint information of the user via the effectively pressed fingerprint sensor.

Abstract: A capacitor includes: a semiconductor substrate; a first insulating layer disposed under the substrate; a first trench group disposed in the substrate and the first insulating layer, the first trench group includes two first trenches which penetrate through the substrate downward from an upper surface of the substrate and enter the first insulating layer, and bottoms of the two first trenches are communicated to form a first cavity structure located in the first insulating layer; a laminated structure disposed above the substrate, in the first trench group, and in the first cavity structure, the laminated structure includes m insulating layers and n conductive layers forming a structure that each insulating layer electrically isolates each conductive layer from each other; a first electrode layer electrically connected to all odd-numbered conductive layers; and a second electrode layer electrically connected to all even-numbered conductive layers.

Abstract: The present application provides a capacitance detection circuit, which could reduce the influence of screen noise on capacitance detection. The capacitance detection circuit includes: an amplification circuit connected to the capacitor to be detected, and configured to convert a capacitance signal of the capacitor to be detected into a voltage signal, the voltage signal being associated with the capacitance of the capacitor to be detected; and a control circuit connected to the amplification circuit, and configured to control an amplification factor of the amplification circuit to be a first amplification factor in a first period, and to control the amplification factor of the amplification circuit to be a second amplification factor in a second period, where noise generated by the screen in the first period is less than noise generated by the screen in the second period, and the first amplification factor is greater than the second amplification factor.

Abstract: This application provides a capacitance detection circuit, which is configured to detect a capacitance between a sensing electrode in a screen and a first driving electrode to which a driving signal is input. The capacitance detection circuit includes: an amplification circuit, connected to the sensing electrode and configured to convert a capacitance signal between the sensing electrode and the first driving electrode into a voltage signal; a cancellation circuit, connected to the amplification circuit and configured to output a cancellation signal to the amplification circuit, where the cancellation signal is used to cancel a noise signal from the screen included in the voltage signal; and a control circuit, connected to a second driving electrode, in the screen, to which no driving signal is input, and configured to generate a control signal, where the control signal is configured to control the cancellation circuit to generate the cancellation signal.

Abstract: An electronic device, a touch detection circuit and an update method for a reference value of a touch screen are provided. The update method includes: acquiring a temperature value of an environment of the touch screen; when determining that the acquired temperature value is less than a preset temperature threshold and determining that a continuously touched area exists in the touch screen, collecting N data frames of the continuously touched area; calculating N feature values of the N data frames; and updating N reference values corresponding to the N data frames according to the N feature values; wherein, N is greater than 1 and N is an integer. A difference between a reference value and a sensed value of the continuously touched area may not be decreased with a temperature rise due to the heat transferred by a touched object, thus point elimination at a low temperature is avoided.

Abstract: An image sensor includes a controller and a plurality of pixel clusters. Each of the pixel clusters includes a plurality of pixels coupled to a reset transistor, a floating diffusion node, a source follower, and a select transistor. Each pixel of a pixel cluster includes a photodiode, and a transfer transistor having a first terminal coupled to the photodiode, a second terminal coupled to the floating diffusion node, and a gate. The controller is configured to apply a transfer control signal to the gate of the transfer transistor in response to a pixel operation, the transfer control signal being one of a positive voltage level, a negative voltage level, and a ground voltage level.

Abstract: Techniques are described for error-modulated pixel readout by column-parallel programmable gain amplifiers (PGAs) in a digital image sensor. Each PGA has an amplifier with gain set by a ratio of input and feedback capacitors. Mismatch between these capacitors can manifest as vertical fixed pattern noise (FPN) in the image output. Embodiments use a swap control signal to pseudo-randomly toggle between two or more swap states for each of a sequence of row scan times. Each swap state at least directs coupling of a particular capacitor network in either the input or the feedback path of the amplifier. Pseudo-randomly swapping those couplings of the capacitive networks also pseudo-randomly modulates gain error from capacitive mismatch between the capacitor networks. The FPN effectively becomes spatially modulated noise at a level far below what would be considered as a visible artifact in the image output.

Abstract: Disclosed are systems, devices and methods for providing fingerprint sensors based on ultrasound imaging techniques in electronic devices and fabrication techniques for producing ultrasound-based fingerprint sensors. In some aspects, an ultrasound fingerprint sensor device includes an intermediate layer coupled to a base chip including an integrated circuit having conducive contacts at a surface of the base chip, the intermediate layer including an insulation layer formed on the base chip and a corresponding array of channeling electrode structures coupled to the conductive contacts and passing through the insulation layer, in which the channeling electrodes terminate at or above a top surface of the insulation layer to provide bottom electrodes; a plurality of ultrasonic transducer elements including an acoustic transducer material coupled to the bottom electrodes; and a plurality of top electrodes positioned on the ultrasonic transducer elements.

Abstract: An image sensor, a fingerprint detection apparatus, and an electronic device are provided. The image sensor includes a pixel circuit array, wherein each pixel circuit is configured to generate an output signal according to a received light signal; and an output circuit is configured to simultaneously receive output signals of a plurality of pixel circuits in the pixel circuit array, and output a signal average value of the output signals of the plurality of pixel circuits. The image sensor has a small area and power consumption.

Abstract: A contact state detection apparatus and a wearable device. The contact state detection apparatus includes: a first electrode and a second electrode, the first electrode and the second electrode being configured to receive an alternating current signal and a first signal to output a differential signal, the differential signal including the first signal and a second signal, the first signal being a detection signal of physiological information of a detected object, and the second signal being a signal formed after the alternating current signal is modulated by the first electrode and the second electrode; and a sampling circuit connected to the first electrode and the second electrode, the sampling circuit being configured to sample the differential signal to obtain a target sampling signal, and the target sampling signal including a first sampling signal corresponding to a first signal and a second sampling signal corresponding to the second signal.

Abstract: A readout circuit includes a ramp generator for generating a plurality of first short ramps having a first level in a reset conversion phase and a plurality of second short ramps having a second level greater than the first level and a full-scale ramp having a third level greater than the second level in a signal conversion phase, a comparator for comparing a first analog signal with each one of the first short ramps to obtain a plurality of first comparison results in the reset conversion phase, and comparing a second analog signal with each one of the second short ramps and the full-scale ramp in the signal conversion phase to generate a plurality of second comparison results and a third comparison result, and a controller configured to determine an output signal value of the second analog signal according to the plurality of second comparison results and the third result.