Active common mode compensation for improved amplifier performance
Granted: December 6, 2022
Patent Number:
11522507
Various techniques are provided to reduce common mode disturbance associated with an amplifier, such as a class D amplifier. In one example, an amplifier includes a power stage configured to generate first and second PWM signals. The amplifier further includes an integration stage comprising input nodes configured to receive an input differential analog signal. The integration stage is configured to generate an output differential analog signal in response to the PWM signals and the…
Device and method for testing interconnection of display module
Granted: December 6, 2022
Patent Number:
11521526
A display driver comprises a decoder, a first source amplifier and a logic circuitry. The decoder is configured to output a grayscale voltage corresponding to an image data. The first source amplifier is configured to output a first source output voltage corresponding to the grayscale voltage to a first external output terminal. The logic circuitry is configured to generate fault detection data for fault detection of a test object connected to the first external output terminal. The…
Force sensing within display stack
Granted: December 6, 2022
Patent Number:
11520423
Embodiments described herein include an input device and associated processing system for sensing force applied by input objects. The input device comprises a display device comprising a plurality of layers formed as a display stack, the display stack including a top surface. The input device further comprises one or more strain gauges disposed within the display stack and configured to detect force applied to the top surface, and a processing system configured to perform display…
Sensor device for transcapacitive sensing with shielding
Granted: December 6, 2022
Patent Number:
11519801
A silicon sensor device includes a plurality of metal layers and a plurality of dielectric layers. The plurality of metal layers include: a first metal layer comprising a plurality of transmitter electrodes and a plurality of receiver electrodes; a second metal layer disposed beneath the first metal layer, wherein the second metal layer comprises a plurality of routing traces for the plurality of transmitter electrodes; and one or more circuit layers disposed beneath the second metal…
Under-display image sensor
Granted: November 29, 2022
Patent Number:
11516374
A device includes a display and a first light source configured to emit light, wherein the first light source is proximate to the display. The device further includes a first camera disposed behind the display, wherein the first camera is configured to detect reflections of the light emitted by the first light source. The first camera is further configured to capture a first image based at least in part on the reflections, wherein the reflections are partially occluded by the display.…
Reducing interference within a display panel while performing input sensing
Granted: November 29, 2022
Patent Number:
11513635
A processing system for an input device comprises sensor circuitry. The sensor circuitry is configured to operate sensor electrodes for input sensing during a first sensing frame. During a first period of the first sensing frame the sensor circuitry is configured to drive a first portion of the sensor electrodes with a sensing signal, drive a second portion of the sensor electrodes with a guarding signal, and drive a third portion of the sensor electrodes with a reference signal. The…
System and method for mitigating impulse noise and burst noise in touch sensing
Granted: November 29, 2022
Patent Number:
11513633
An input device comprising a set of electrodes configured to detect a user input of a user and a processing system is provided. The processing system comprises a signal level monitor configured to detect burst noise or impulse noise and one or more processors configured to: perform a scan step of a plurality of scan steps by driving one or more first transmitter electrodes of the plurality of transmitter electrodes with one or more sensing signals; obtain one or more first resulting…
Built-in test of a display driver
Granted: November 22, 2022
Patent Number:
11508273
A display driver includes image processing circuitry, driver circuitry, and test circuitry. The image processing circuitry is configured to generate first output data during a first display update period and generate second output data during a second display update period. The driver circuitry is configured to update a display panel based on the first output data during the first display update period and update the display panel based on the second output data during the second display…
Sensor patterns for capacitive imaging sensors in touch displays
Granted: November 22, 2022
Patent Number:
11507236
A sensor pattern for capacitive sensing includes a first electrode and a multitude of second electrodes capacitively coupled to the first electrode. The first electrode includes a strip extending in a vertical direction across the sensor pattern. The multitude of second electrodes include a first subset and a second subset. The first subset of the multitude of second electrodes is arranged in a first column, the first column extending in a vertical direction. The second subset of the…
Using electrical resistance to estimate force on an electrode during temperature changes
Granted: November 8, 2022
Patent Number:
11494023
A processing system includes sensor circuitry and processing circuitry. The sensor circuitry is configured to, using the sensor electrodes, obtain capacitive measurements of a sensing region, and obtain a resistance measurement of the sensing region. The processing circuitry is coupled to the sensor circuitry. The processing circuitry is configured to determine a location of an input object using the capacitive measurements of the sensing region; and determine a force value based on the…
Strain sensing in foldable displays
Granted: November 1, 2022
Patent Number:
11488499
A method and apparatus for sensing strain in a flexible electronic display. In some implementations, a display controller may be coupled to an electronic display panel. The display controller is configured to receive sensor signals from one or more piezoresistive sensors disposed in the electronic display panel, determine an amount of strain in the electronic display panel based on the received sensor signals, determine a bend angle of the electronic display panel based on the determined…
Device and method for driving a self-luminous display panel
Granted: October 25, 2022
Patent Number:
11482175
A display driver comprises gamma processing circuitry, compensation circuitry, and driver circuitry. The gamma processing circuitry is configured to process the image data to generate gamma processed image data. The compensation circuitry is configured to process the gamma-processed image data, based on a ratio of a number of display elements that emit light to a total number of display elements of a display panel, to generate compensated image data. The driver circuitry is configured to…
Transimpedance amplifier (TIA)-based global coarse baseline correction (GCBC) for capacitive sensing
Granted: October 25, 2022
Patent Number:
11481076
A method and apparatus of global coarse baseline correction (GCBC) for capacitive scanning. An input device may include a number (N) of sensor electrodes, a GCBC circuit, and detection circuitry. Each sensor electrode is associated with a respective channel. The GCBC circuit produces sensing signals in each of the N channels and the detection circuitry may detect changes in the capacitances of one or more sensor electrodes based on the sensing signals. In some implementations, the GCBC…
Method and system for quadrature proximity sensing
Granted: October 25, 2022
Patent Number:
11481074
A processing system for an input device includes an in-phase and quadrature (I/Q) receiver module including a first and second charge integrators, and first and second demodulator modules. The I/Q receiver module alternates integration of a resulting signal, received from a receiver electrode of the input device, between the first and the second charge integrators in four consecutive quarter cycles, to obtain four consecutive integration results. The four consecutive quarter cycles…
Touch-to-display interference mitigation in touch displays
Granted: October 25, 2022
Patent Number:
11481068
An input-display device includes a display screen with display pixels, capacitive sensing electrodes for capacitive sensing in a sensing region of the display screen, and a gate driver circuit associated with the display screen. The gate driver circuit superimposes a critical time window on a full-duration gate control pulse of a gate control signal. The critical time window partially overlaps with the full-duration gate control pulse at least at an end of the full-duration gate control…
System and method for subpixel rendering and display driver
Granted: October 18, 2022
Patent Number:
11475822
A system and method for rendering subpixels comprising performing an eight-color halftoning process on the second image data to generate third image data which describe a grayscale value of each of an R subpixel, a G subpixel and a B subpixel of each pixel with one bit, generating the third image data by performing a dithering process on the second image data using a dither value selected from elements of the dither table, when the third image data associated with a pixel of interest of…
Overlapping muxes for common mode noise removal
Granted: October 18, 2022
Patent Number:
11474654
Sensing systems and methods that utilize zero row sum code division multiplexing (CDM) drive matrices to reduce or eliminate radiative emissions. Measurements corresponding to an input received at a sensing region of the input device are obtained by driving a first subset of transmitters of the input device according to a first portion of a CDM drive matrix, wherein the CDM matrix is a zero row sum matrix, and obtaining first measurement signals with the plurality of receivers, and…
Display noise filter for a sensing device
Granted: October 18, 2022
Patent Number:
11474635
An input device comprises a plurality of sensor electrodes and a processing system coupled to the plurality of sensor electrodes. The processing system comprises a sensor driver. The sensor driver comprises clock synchronization circuitry, a blocking pulse generator, and a sensor module. The clock synchronization circuitry is configured to receive an external clock signal, and synchronize an internal clock signal with the external clock signal. The blocking pulse generator is configured…
Source output voltage compensation for display noise
Granted: October 11, 2022
Patent Number:
11467694
An input-display device includes a display screen disposed on a display substrate, the display screen including a multitude of display pixels. The input-display device further includes a multitude of capacitive sensing electrodes for capacitive sensing in a sensing region of the display screen. The input-display device also includes a source driver circuit configured to generate a data voltage for driving a pixel circuit associated with one display pixel of the multitude of display…
Device and method for compensating a voltage drop in display panels driven by multiple display drivers
Granted: October 4, 2022
Patent Number:
11462164
A display system includes a display panel and first and second display drivers. The first display driver is configured to generate first region total current data corresponding to a subtotal of estimated pixel currents of respective pixels in a first region of the display panel. The second display driver is configured to generate second region total current data corresponding to a subtotal of estimated pixel currents of respective pixels in a second region of the display panel. The first…
