Synaptics Patent Applications

EFFICIENT HIGH VOLTAGE SQUARE WAVE GENERATOR

Granted: January 5, 2017
Application Number: 20170005646
This disclosure generally provides a system, active input device, and method for generating an amplified square wave signal based on an input signal. The method comprises generating a pulse signal based on the input signal, and driving a switching signal based on the pulse signal to control a first switch. A pulse width of the pulse signal is adaptively controlled using a control signal generated based on the amplified square wave signal. An output terminal of the first switch is coupled…

ELECTRODE COMBINING FOR NOISE DETERMINATION

Granted: December 29, 2016
Application Number: 20160378221
In a method of capacitive sensing, a first plurality of sensor electrodes of a sensor electrode pattern is coupled, in a first configuration, to input channels of a processing system. The sensor electrode pattern is associated with a sensing region. The first configuration of the first plurality sensor of electrodes is utilized to acquire a measurement of current. A noise environment is determined through analysis of the measurement of current. At least one subset of the first plurality…

CURRENT-MODE BANDGAP REFERENCE WITH PROPORTIONAL TO ABSOLUTE TEMPERATURE CURRENT AND ZERO TEMPERATURE COEFFICIENT CURRENT GENERATION

Granted: December 1, 2016
Application Number: 20160349786
In a current-mode bandgap reference integrated circuit: a bandgap voltage generator is configured to generate a bandgap voltage, a zero-temperature coefficient current generator configured to generate a zero-temperature coefficient current, and a proportional to absolute temperature current generator configured to generate a proportional to absolute temperature current. The integrated circuit includes a first pair of bipolar junction transistors (BJT) comprising a first BJT and a second…

SEMICONDUCTOR DEVICE AND ELECTRONIC APPARATUS

Granted: September 15, 2016
Application Number: 20160266590
Detection circuits cause a power supply circuit to start an initialization sequence by detecting abnormal behavior where an external power supply voltage is cut off, the power supply circuit generating a first internal power supply voltage from a first external power supply voltage and generating a second internal power supply voltage from a second external power supply voltage higher than the first external power supply voltage in terms of an absolute value, and an auxiliary amplifier…

INPUT SENSING AND EXCLUSION

Granted: September 15, 2016
Application Number: 20160266674
In a method of input sensing and exclusion, an input is detected within a sensing region of an input device. It is determined that the input is along an edge of the input device. It is then determined whether the input satisfies exclusion criteria. Responsive to satisfaction of the exclusion criteria, the input is excluded from consideration as valid input.

OVERLAY FOR DISPLAY SELF REFRESH

Granted: June 23, 2016
Application Number: 20160180796
A display device, a processing system, and a method are provided for updating a display device using self-refresh techniques. The described system is configured to overlay dynamic data from a source over a static image in the display device. Components of the described system may include the overlay for non-static image data, compression of the overlay, and dirty region tracking for the source display engine.

OPERATING A TOUCH SCREEN CONTROL SYSTEM ACCORDING TO A PLURALITY OF RULE SETS

Granted: April 7, 2016
Application Number: 20160098146
A touch screen control system communicates with a host processing system (HPS). The touch screen control system includes a memory and control circuitry. The control circuitry operates a touch screen according to rules stored in the memory by: during a first time period and in response to detecting a first type of user input with a touch sensor of the touch screen, updating a display screen of the touch screen autonomously without requiring intervention from the HPS following the…

RETRACTABLE KEYBOARD KEYS

Granted: February 25, 2016
Application Number: 20160055990
A laptop computer comprising a keyboard including a bezel having a plurality of key openings and a plurality of key holding features configured adjacent to the plurality of key openings on a bottom side of the bezel. The laptop computer also includes a plurality of keycaps having a touch surface for receiving a press force, each keycap positioned within a respective one of the plurality of key openings. The laptop computer also includes a chassis having a plurality of planar-translation…

TECHNIQUES TO DETERMINE X-POSITION IN GRADIENT SENSORS

Granted: December 31, 2015
Application Number: 20150378468
Embodiments of the invention generate a voltage gradient across a sensor electrode by driving a negative and positive voltage on respective ends of the electrode to identify a location of an input object. Because both negative and positive voltages are used, one location on the sensor electrode will be at a reference voltage (e.g., system ground). This location is used to divide the sensor electrode into two different regions. Based on measuring a change in charge relative to a baseline,…

HYBRID CAPACITIVE SENSOR DEVICE

Granted: December 31, 2015
Application Number: 20150378498
In an example, an input device includes: a plurality of transmitter electrodes including: a first transmitter electrode having a first set of sub-electrodes; and a second transmitter electrode having a second set of sub-electrodes, where the number of sub-electrodes in the first set is different than the number of sub-electrodes in the second set; a plurality of receiver electrodes; and a processing system, coupled to the plurality of transmitter electrodes and the plurality of receiver…

CAPACITIVE SENSING PATTERN

Granted: December 10, 2015
Application Number: 20150355757
A capacitive input device comprises a plurality of receiver electrodes and a plurality of transmitter electrodes. The plurality of receiver sensor electrodes is oriented substantially parallel to a first axis proximate to a sensing region of the capacitive input device. The plurality of transmitter sensor electrodes is oriented substantially parallel to a second axis proximate to the sensing region and configured to be capacitively coupled with the plurality of receiver sensor…

CURRENT FEEDBACK DIGITAL CHARGE ACCUMULATOR

Granted: December 3, 2015
Application Number: 20150346896
Embodiments of the present invention generally provide a method of input sensing with a sensor electrode. The method includes driving an input sensing signal to charge the sensor electrode and sampling a first voltage associated with the sensor electrode. The method further includes removing charge from the sensor electrode when the first voltage is above a threshold voltage, adding charge to the sensor electrode when the first voltage is below the threshold voltage, determining a number…

SYSTEM AND METHOD FOR DETECTING AN ACTIVE PEN WITH A MATRIX SENSOR

Granted: November 26, 2015
Application Number: 20150338937
A processing system, input device, and method are disclosed to detect an active input device. The method includes operating a first portion of a plurality of sensor electrodes to receive an active input signal from an active input device, and operating a second portion of the plurality of sensor electrodes to receive capacitive sensing data corresponding to a passive input device. The first and second portions include at least one sensor electrode in common. The method also includes…

CAPACITANCE MEASUREMENT

Granted: November 12, 2015
Application Number: 20150323578
A capacitance measurement circuit comprises a differential amplifier with first and second inputs and an output, first and second feedback capacitances, and a reset mechanism. The first input is coupled to a modulated reference voltage and the second input is coupled with a sensor electrode. A first feedback capacitance is coupled between the output and the second input. A second feedback capacitance is coupled between the output and the second input. The reset mechanism resets the first…

CAPACITIVE SENSING ON LARGE TOUCH SCREENS

Granted: November 12, 2015
Application Number: 20150324036
An input device comprises a first plurality of sensor electrodes, a second plurality of sensor electrodes, and a processing system. The processing system comprises a first integrated circuit, a second integrated circuit, and a central controller. The first integrated circuit is coupled to the first plurality of sensor electrodes and configured to receive first resulting signals therewith. The second integrated circuit is coupled to the second plurality of sensor electrodes and configured…

WEIGHTING FOR DISPLAY NOISE REMOVAL IN CAPACITIVE SENSORS

Granted: October 29, 2015
Application Number: 20150309618
A processing system for a capacitive sensing input device comprises a sensor module and a determination module. The sensor module acquires a plurality of capacitive resulting signals by operating a plurality of sensor electrodes for capacitive sensing. The determination module weights values of the plurality of capacitive resulting signals to achieve a plurality of weighted capacitive resulting signals, wherein a first capacitive resulting signal of the plurality of capacitive resulting…

SOURCE DRIVER TOUCH TRANSMITTER IN PARALLEL WITH DISPLAY DRIVE

Granted: October 29, 2015
Application Number: 20150309643
Various embodiments enable driving one or more sub-pixels with a source voltage while concurrently modulating the voltage of one or more common electrodes coupled to the sub-pixels to perform input sensing with the common electrodes. The voltage driven onto the sub-pixel may be shifted while the common electrode is modulated by a value about equal to about the amplitude of the modulation applied to the common electrode. Thus, the potential difference between the source line and common…

SENSOR ELECTRODE PATH ERROR DIAGNOSIS

Granted: October 22, 2015
Application Number: 20150301658
A processing system for a capacitive sensing input device comprises a sensing module, a first internal diagnostic mechanism, and a determination module. The sensing module is configured to couple with a first sensor electrode path of a plurality of sensor electrode paths, and is configured to drive the first sensor electrode path with a first signal. The first internal diagnostic mechanism is configured to couple with a second sensor electrode path and to acquire a test signal output…

SENSING DURING NON-DISPLAY UPDATE TIMES

Granted: October 22, 2015
Application Number: 20150302831
A method of capacitive sensing using an integrated capacitive sensor device and display device comprising a plurality of combination electrodes comprises driving a first of the plurality of combination electrodes for capacitive sensing during a first non-display update time period of a first frame; driving a second of the plurality of combination electrodes for capacitive sensing during a second non-display update time period of the first frame; and driving a third of the plurality of…

MATRIX SENSOR FOR IMAGE TOUCH SENSING

Granted: October 15, 2015
Application Number: 20150293642
Embodiments described herein include an input device, a display device having a capacitive sensing device, a processing system and a method for detecting presence of an input object using a capacitive sensing device. In one embodiment, an input device includes a plurality of sensor electrodes arranged in a planar matrix array. Each sensor electrode is coupled to unique routing trace and has an identical geometric plan form that is symmetrical about a center of area of the sensor…