Synaptics Corporation

National Semiconductor Corporation

Idex Biometrics Asa

Synaptics Incorpoated

Synaptics Incorported

Christopher A Ludden

Petr Shepelev

Stephen L Morein

Joseph Kurth Reynolds

Jeffrey Lukanc

Thomas A Mackin

Imre Knausz

Greg P Semeraro

Jeffrey Alan Small

Richard Alexander Erhart

John Childs

Mark Kuhns

Jeffrey S Lillie

Bruce C Moore

Donald E Camp

Arif Alam

Shawn P Day

David W Gillespie

Eric Scott Bohannon

Marshall J Bell

Murat Ozbas

Mark Pude

Biometric module configured to perform processing as part of a device configured to perform contactless or contact communication with a terminal, the module comprising: a biometric sensor; a display screen; and a control unit configured to: cause the biometric sensor to capture biometric data of a user which can be used to biometrically authenticate the user; obtain biometric authentication information indicating whether the user was biometrically authenticated based on the captured biometric data; and in response to the biometric authentication information indicating the user was biometrically authenticated, cause the display screen to display authenticated information.

Device with biometric-gated display

An LC display driver including a gamma reference circuit to generate N gamma-compensated reference voltages based on at least one pre-defined gamma curve divided into M regions defined by M+1 breakpoint voltages, each generated by a range-region DAC coupled to a subset of voltage taps of a range resistor string (some subsets overlapping). An output circuit generates the N gamma-compensated reference voltages, and includes a reference resistor string with N reference voltage taps, and M+1 breakpoint locations to receive respective breakpoint voltages, the N reference voltage taps divided into M subsets corresponding to the M regions of the gamma curve, each of the M subsets of reference voltage taps forming a voltage divider. N output selector circuits output a corresponding one of the N gamma-compensated reference voltages based on a respective reference voltage tap and the associated voltage divider.

Display driver

Embodiments described herein mitigate the effect of a coupling capacitance between a sensor electrode in a touch sensor and a display electrode in a display screen. An input device, which includes the touch sensor and display screen, may transmit a guarding signal on the display electrodes when performing capacitive sensing. In one embodiment, the guarding signal may have similar characteristics as a modulated signal (e.g., similar amplitude and/or phase) driven on the sensor electrode to detect interaction between the input device and an input object. By driving a guarding signal that is similar to the modulated signal onto the display electrodes, the voltage difference between the sensor electrode and display electrode remains the same. Accordingly, the coupling capacitance between the sensor electrode and the display electrode does not affect a capacitance measurement used to detect the user interaction.

Display guarding techniques

Embodiments described herein include a processing system for a display device comprising an integrated capacitive sensing device that includes at least one input/output pad that is selectable between providing source signals to the display device and operating a sensor electrode for capacitive sensing. Other embodiments include a display device having a capacitive sensing device, an input device having an integrated display and capacitive sensing device, and a method for operating an integrated display and capacitive sensing device.

Flexible processing module for different integrated touch and display configurations

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 electrode. The geometric plan form of each sensor electrode includes core and a plurality of protrusions extending outward from the core. The protrusions are configured to overlap with protrusions extending outward from each adjacent sensor electrode of the matrix array.

Matrix sensor for image touch sensing

Embodiments of the disclosure generally provide an integrated control system having an integrated controller that is configured to provide both display updating signals to a display device and a capacitive sensing signal to a sensor electrode that is disposed within the integrated input device. The internal and/or external signal routing configurations described herein can be adapted to reduce signal routing complexity typically found in conventional devices and reduce the effect of electrical interference created by the capacitive coupling formed between the display routing, capacitive sensing routing and/or other components within the integrated control system. Embodiments can also be used to reduce electromagnetic interference (EMI) on the display and touch sensing signals received, transmitted and processed within the integrated control system.

Multi-sensor touch integrated display driver configuration for capacitive sensing devices

A display device having a capacitive sensing device, a processing system, and a method are provided for detecting presence of an input object using a capacitive sensing device having a plurality of sensor electrodes arranged in a matrix. The described technique programmatically combines multiple sensor electrodes into a larger sensor electrode for absolute capacitive sensing. The sets of sensor electrodes that are combined may be selectively coupled based a window size and a step size associated with a number of sensor electrodes in common between the sets.

Combining sensor electrodes in a matrix sensor

A system comprising a display screen configured for displaying images, a touch sensor having a sensing region, a host processing system and a touch screen control system. The touch screen control system comprising touch sensor control circuitry configured to operate the touch sensor and display control circuitry configured to operate the display screen. The display circuitry comprising a first memory configured to hold a primary image and a second memory configured to hold a secondary image and display refresh circuitry. The display refresh circuitry configured to update the display screen, and in response to the user input and without requiring intervention by the host processing system, generate a blended image comprising the primary image and the secondary image, and update the display screen with the blended image.

Reduction in latency between user input and visual feedback

Embodiments of the invention generally provide an input device with display screens that periodically update (refresh) the screen by selectively driving common electrodes corresponding to pixels in a display line. In general, the input devices drive each electrode until each display line (and each pixel) of a display frame is updated. In addition to updating the display, the input device may perform capacitive sensing using the display screen as a proximity sensing area. To do this, the input device may interleave periods of capacitive sensing between periods of updating the display based on a display frame. For example, the input device may update the first half of display lines of the display screen, pause display updating, perform capacitive sensing, and finish updating the rest of the display lines. Further still, the input device may use common electrodes for both updating the display and performing capacitive sensing.

Distributed blanking for touch optimization

An electrode matrix that is used for capacitive sensing may be integrated into a display panel of an input device. In one embodiment, source drivers may be mounted on the display panel which drive the display signals and capacitive sensing signals into the display panel. In one embodiment, the capacitive sensing signals may be routed on traces or lines that are interleaved on the same layer as the source lines used for setting a voltage on the pixels in the display panel during display updating. Using the interleaved traces, the source drivers may drive the capacitive sensing signals in parallel to a plurality of the electrodes in the matrix in a predefined pattern that spans one or more sensing cycles.

Capacitive sensing using a matrix electrode pattern

An electrode matrix that is used for capacitive sensing may be integrated into a display panel of an input device. In one embodiment, source drivers may be mounted on the display panel which drive the display signals and capacitive sensing signals into the display panel. In one embodiment, the capacitive sensing signals may be routed on wires or lines that are interleaved on the same layer as the source lines used for setting a voltage on the pixels in the display panel during display updating. Using the interleaved wires, the source drivers may drive the capacitive sensing signals in parallel to a plurality of the electrodes in the matrix in a predefined pattern that spans one or more touch cycles.

Growing community of inventors

Pittsford, NY, United States of America

Christopher A Ludden