Abstract: Embodiments of the invention generally provide a display device that includes a controller that is communicatively coupled between a display source and source drivers. The controller and source drivers include respective decompression engines that can decompress the compressed data received from the display source. Instead of sending all of the compressed data to the source drivers, the controller evaluates the uncompressed data and identifies what portion of the compressed data corresponds to each of the source drivers. Moreover, the controller may determine a decompression engine state that corresponds to each portion of the compressed data. The saved engine state is transmitted to the source drivers which then initialize their decompression engines using the engine states.

Abstract: A hierarchical gate driver circuit for an array of pixel elements. The hierarchical gate driver circuit includes a shift register and two or more groups of gate lines drivers. The shift register is configured to activate a plurality of select lines based at least in part on a periodic clock signal. A first group of gate line drivers is configured to drive a plurality of first gate lines, each coupled to a respective row of first pixel elements in the array, when a first select line of the plurality of select lines is activated. A second group of gate line drivers is configured to drive a plurality of second gate lines, each coupled to a respective row of second pixel elements in the array, when a second select line of the plurality of select lines is activated.

Abstract: Display devices with improved routing between connectors and source drivers disposed on a substrate such as glass. Various features improve different characteristics of the routings between the connectors and source drivers. For example, a t-shaped connector is provided to ensure voltage provided to the source drivers is approximately equal. Routings may be tapered (i.e., altered in width) to reduce the amount of area consumption in locations where doing so is desirable but to decrease resistance in areas having more space. Routings may also include stacked power supply and ground traces to provide benefits such as improved decoupling capacitance. Other features are provided.

Abstract: A processing system for an integrated display and capacitive sensing device, where the display includes light-emitting diode (LED) pixels. The processing system includes isolated supply domains having inputs that receive an anode voltage and a cathode voltage, first outputs that supply modulated anode voltages, and second outputs that modulated cathode voltages, where the modulated anode voltages and the modulated cathode voltages are constant with respect to each other and modulated with respect to an external reference voltage. The processing system additionally includes a multiplexer circuit having inputs coupled the isolated supply domains, the anode voltage, and the cathode voltage, and having outputs coupled to the LED pixels. Further, the processing system includes control logic configured to control the multiplexer circuit to selectively supply the anode voltage and the cathode voltage, or the modulated anode voltages and the modulated cathode voltages, to the LED pixels.

Abstract: An example circuit includes: a filter configured to process a digital signal through at least one stage; and a coefficient generator circuit configured to generate coefficients for the at least one stage of the filter. The coefficient generator circuit includes: a lookup-table (LUT) configured to output a differential sequence; an up-sampling holder circuit configured to up-sample and hold the differential sequence to generate an up-sampled differential sequence; and an accumulator configured to integrate the up-sampled differential sequence to generate the coefficients.

Abstract: This disclosure generally provides a fingerprint sensor that derives a fingerprint by measuring capacitive sensing signals while modulating a reference voltage rail used to power the fingerprint sensor. In one embodiment, the fingerprint sensor is integrated into an electronic device which may include other components such as a display, I/O devices, speakers, and the like. To power these components, the electronic device may include a DC power supply which outputs reference voltages. When transmitting the reference voltages to the fingerprint sensor, the electronic device may modulate the voltages using a modulating signal. Because the reference voltages are used to power the components in the fingerprint sensor, modulating the rail voltages also causes the components coupled to the reference voltages to also modulate. While this modulation occurs, the fingerprint sensor measures resulting signals using a plurality of sensor electrodes which are then processed to derive a fingerprint.

Abstract: 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.

Abstract: A system and method for updating a display panel having a plurality of display lines, a plurality of gate lines and a plurality of pixels. A first pixel pair of the pixels is coupled to at least three gate lines and two source lines. A display driver is coupled to the source lines, and is configured to drive the source lines to update the pixels.

Abstract: 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.

Abstract: An example circuit includes: a filter configured to process a digital signal through at least one stage; and a coefficient generator circuit configured to generate coefficients for the at least one stage of the filter. The coefficient generator circuit includes: a lookup-table (LUT) configured to output a differential sequence; an up-sampling holder circuit configured to up-sample and hold the differential sequence to generate an up-sampled differential sequence; and an accumulator configured to integrate the up-sampled differential sequence to generate the coefficients.

Abstract: In an example, a method of processing an integrated circuit (IC) die including active circuitry formed on a substrate and a front side having a plurality of metal layers formed on the substrate. The method includes forming vias in a substrate of the IC die using a laser configured to drill the vias from the front side of the IC die. The method includes forming metal contacts on first metal pads, and metal interconnects between second metal pads and the vias, using an single electroplating process, where the first metal pads and the second metal pads are exposed parts of a top layer of the plurality of metal layers, and where the metal interconnects at least partially fill the vias. The method includes thinning the substrate of the IC die to expose the metal interconnects in the vias at a back side of the IC die opposite the front side.

Abstract: Embodiments of the invention generally provide a display panel that uses predefined criteria to determine when to send a request for a display frame to a display source. The predefined criteria may be, for example, when the display panel needs to refresh the display faster than the display source transmits display frames, when the display source fails to send a new display frame within a specified time period, when a maximum refresh time is exceeded and the displayed image begins to decay or leak, and the like. Furthermore, the display panel may include a frame buffer for storing the display frames received from the display source. Additional predefined criteria may be when the display frame stored in the frame buffer becomes corrupted or when the frame buffer lacks enough available memory to store the frame. In response, the display panel may request the display source retransmit the previous display frame.

Abstract: An example method of performing capacitive sensing and display updating in an integrated capacitive sensing device and display device includes driving a plurality of display electrodes with one or more display voltages from one or more supplies during a first time period, the one or more voltages configured to drive the display pixels. The method further includes initiating a long horizontal blanking interval during a second time period. The method further includes driving a plurality of sensor electrodes with one or more sensing voltages from the one or more supplies during the second time period to perform capacitive sensing. The method further includes activating first circuitry during one of the first time period or the second time period to draw current to equalize power drawn from the one or more supplies during the first and second time periods within a threshold.

Abstract: In one embodiment, a system includes one or more source drivers operable to drive a portion of a row or column of a display. The system also includes a timing controller coupled to each of the one or more source drivers and configured to control the one or more source drivers. The system further includes a downstream link for each of the one or more source drivers, configured to transfer data from the timing controller to one of the one or more source drivers. The system also includes an upstream link for each of the one or more source drivers, configured to transfer uplink data from one of the one or more source drivers to the timing controller, wherein the uplink data includes at least one of downlink lock status information and touch data.

Abstract: An example circuit includes: a plurality of analog-to-digital converters (ADCs) receiving a respective plurality of analog signals and outputting a respective plurality of digital signals; a coefficient generator circuit outputting a coefficient signal; and a plurality of decimation filters each including a first input that receives a respective one of the plurality of digital signals and a second input that receives the coefficient signal, each of the plurality of decimation filters including a finite impulse response (FIR) filter having a multiplier and a single accumulator.

Abstract: Techniques for removing display-based corrupting components from a capacitive sensing signal are provided. A routing carrying display related signals (e.g., a source signal for sub-pixel updating) may induce corrupting current into a routing for carrying capacitive sensing signals. This corrupting current may reduce the ability to determine presence of an input object via the sensing signal. Therefore, the corrupting signal is effectively removed by driving the display elements with a dot inversion technique and by performing capacitive sensing for a sensor electrode during a time in which an even number of display rows are driven for display updates. Dot inversion causes the corrupting current to alternate polarity. Thus, driving sensor electrodes in a period of time in which an even number of rows is driven means that an equal number of positive and negative polarity corrupting currents are induced into the sensing signal.

Abstract: This disclosure generally provides a processing system that includes a first controller coupled with a second controller via a first communication link. The first controller is configured to transmit display data and configuration data to the second controller via the first communication link. The second controller is configured to drive, using the display data, one or more coupled display electrodes for performing display updating. The second controller is further configured to operate one or more coupled sensor electrodes using the configuration data to acquire capacitive sensing data, and to transmit the capacitive sensing data to the first controller via the first communication link.

Abstract: This disclosure generally provides a processing system that includes a first controller coupled with a second controller via a first communication link. The first controller is configured to transmit display data to the second controller via the first communication link. The second controller is configured to drive, using the display data, one or more coupled display electrodes for performing display updating. The second controller is further configured to operate one or more coupled sensor electrodes to acquire capacitive sensing data, and to transmit the capacitive sensing data to the first controller via the first communication link.

Abstract: 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.

Abstract: An input device comprising a display device having an integrated capacitive sensing device. The input device includes a plurality of sensor electrodes a plurality of display electrodes, a modulated power supply configured to provide a modulated reference signal, and a processing system. The processing system includes a sensor module configured to drive a plurality of sensor electrodes with a modulated capacitive sensing signal that is based on the modulated reference signal for capacitive sensing during a first time period. The processing system also includes a display driver module configured to drive a plurality of display electrodes of a display device with modulated signals based on the modulated reference signal during the first time period. The modulated signals cause voltage between the plurality of display electrodes and the plurality of sensor electrodes to remain substantially constant.