Abstract: Systems and processes for stimulating a touch sensor panel using orthogonal frequencies are provided. In one example process, the drive lines of the touch sensor panel can be stimulated with stimulation signals having orthogonal frequencies. The orthogonal frequencies can be separated by a frequency that is inversely proportional to an integration time of the touch sensor panel. The touch signals generated in response to the stimulation signals can be amplified, converted into digital form, demodulated using the orthogonal frequencies, and integrated over the integration time. Integrating the demodulated signals over a length of time that is inversely proportional to the frequency spacing between the orthogonal frequencies reduces or eliminates interference in the touch signals caused by the stimulation signals having different frequencies.

Abstract: Systems, methods, and devices are provided to calibrate an electronic display to reduce or eliminate mura artifacts. Such mura artifacts may be due to differential behavior of multiple common voltage layers (VCOMs) of the display. One method for reducing or eliminating such muras may involve setting pixels of an electronic display to a gray level and setting an operating parameter of the liquid crystal display to a starting value. An image of the pixels may be captured. Using the image, an average luminance of the pixels may be determined and the image may be amplified around the average luminance to enhance contrast of the image. When the amplified image substantially does not indicates the presence of a mura, the value of the operating parameter may be stored in the electronic display.

Abstract: Systems, methods, and devices for calibrating an electronic display to reduce or eliminate a mura artifact are provided. The mura artifact may be due to differential behavior of common voltage layers (VCOMs) in the electronic display. One method for reducing or eliminating the mura artifact may involve setting pixels of the electronic display to a first gray level and measuring a luminance difference between light and dark areas of a mura artifact on the electronic display. A value of an operating parameter of the electronic display may be adjusted while monitoring the luminance difference measurement. A value of the operating parameter that causes the luminance difference measurement to be within a specified range of acceptable luminance difference measurement values may be stored in the electronic display.

Abstract: Devices and methods for reducing display-to-touch crosstalk are provided. In or more examples, an electronic display panel may include a pixel. The pixel may include a pixel electrode, a common electrode, and a first transistor having a first source coupled to a data line, a first gate coupled to a gate line, and a first drain coupled to the pixel electrode. The first transistor may be configured to pass a data signal from the data line to the pixel electrode upon receipt of an activation signal from the gate line. The pixel may also include a second transistor having a second source coupled to the common electrode, a second gate coupled to the gate line, and a second drain coupled to a common voltage source. The second transistor may be configured to cause a parasitic capacitance between the gate line and the second drain of the second transistor instead of between the gate line and the first drain of the first transistor.

Abstract: Systems and methods for calibrating an electronic display to reduce or eliminate a mura artifact are provided. The mura artifact may be due to differential behavior of common voltage layers (VCOMs) in the electronic display. One method for reducing or eliminating the mura artifact may involve turning on an electronic display and programming pixels the electronic display to a uniform gray level. An initial luminance value may be determined and, after waiting a period of time, a subsequent luminance of the pixels may be measured. When a difference between the subsequent luminance and initial luminance is within a threshold, the mura artifact may be understood to have settled and the electronic display may be calibrated.

Abstract: Systems, devices, and methods for using clock detector circuitry to reduce turn-on time of an electronic display, improve image quality, and reduce operations of a host are provided. In one example, a system may include a host configured to transmit a number of signals and a display driver coupled to the host. The number of signals may include a clock signal and data signals. The display driver is configured to drive a display based at least in part on the data signals. The display driver is also configured to be reset upon detection of the clock signal without waiting for a host-issued reset signal. A clock detect circuit configured to detect the clock signal may be configured to transmit an internal reset signal to reset the display driver without a dedicated host-issued reset signal.

Abstract: Methods and devices for improving image quality in a display having multiple common voltage layers (VCOMs) are provided. In one example, a method may include maintaining a deactivation signal on pixels of the display after programming a frame of data onto the pixels of the display, but before a touch sequence. The method may also include supplying a first data signal to each pixel of a first set of pixels coupled to a first VCOM while maintaining the deactivation signal. The method may include supplying a second data signal to each pixel of a second set of pixels coupled to a second VCOM while supplying the first data signal. The first data signal is supplied to each pixel of the first set of pixels and the second data signal is supplied to each pixel of the second set of pixels to inhibit image distortion during the touch sequence.

Abstract: A wireless data processing device is described which periodically exits an unpowered state and transmits location data. For example, one embodiment of a wireless data processing device comprises: power circuitry for maintaining the wireless data processing device in a powered or unpowered state, the power circuitry causing the wireless data processing device to enter into an unpowered state responsive to user input; a timer to periodically power up the wireless device or portion thereof in response to reaching a predetermined time; a location services module determining a current location of the wireless data processing device using one or more specified location determination techniques; a transmit thread transmitting the current location of the wireless device over one or more specified communication channels; and the power circuitry powering down the wireless data processing device a second time after the current location has been transmitted.

Abstract: A display may receive image data to be displayed for a user of an electronic device. Display driver circuitry in the display may analyze the data to detect static data. The image data may contain static frames of data or static portions of a frame of data. In response to detection of static data, the display driver circuitry can take actions to avoid display damage due to burn-in effects. The display driver circuitry may reduce a peak luminance value associated with a peak luminance control algorithm, may reduce display brightness, may map image data to reduced brightness levels, or may take other actions to ensure that display pixels in the display are not damaged. Temperature information may be used in determining how to classify information as static data and in determining how significantly to reduce display pixel drive currents in response to the detection of static image data.

Abstract: Systems, methods, and devices are disclosed, including a device having a liquid-crystal display (LCD) panel that includes a transistor-degradation circuit. In some embodiments, the transistor-degradation circuit is configured to output a signal indicative of a change in a property of a transistor on the LCD panel over time.

Abstract: A touch screen to reduce touch pixel coupling. In some examples, the touch screen can include a first display pixel and a second display pixel in a row of display pixels, where the first display pixel can be configurable to be decoupled from the second display pixel during at least a touch sensing phase of the touch screen. In some examples, the touch screen can include a display pixel having a first and a second transistor, where the second transistor can be electrically connected to a gate terminal of the first transistor, and can be diode-connected. In some examples, the touch screen can include two display pixels, each display pixel having two transistors, where two of the transistors can be electrically connected to a first gate line, and the remaining two transistors can be individually electrically connected to a second and third gate line, respectively.

Abstract: A wireless data processing device is described which periodically exits an unpowered state and transmits location data. For example, one embodiment of a wireless data processing device comprises: power circuitry for maintaining the wireless data processing device in a powered or unpowered state, the power circuitry causing the wireless data processing device to enter into an unpowered state responsive to user input; a timer to periodically power up the wireless device or portion thereof in response to reaching a predetermined time; a location services module determining a current location of the wireless data processing device using one or more specified location determination techniques; a transmit thread transmitting the current location of the wireless device over one or more specified communication channels; and the power circuitry powering down the wireless data processing device a second time after the current location has been transmitted.

Abstract: One embodiment of an apparatus to control and sense a voltage through a single node can include a comparator to monitor single node voltage, a transistor to discharge voltage through the single node and control logic. The control logic can have at least two operational phases when actively controlling the voltage through the single node. In a first phase, the control logic can configure the comparator to determine if the single node voltage is greater than a reference voltage. In a second phase, the control logic can configure the transistor to discharge voltage through the single node when the comparator has previously indicated that the single node voltage is greater than a reference voltage. The control logic can alternatively execute first and second phases to discharge the voltage to a predetermined level.

Abstract: An electronic circuit component is provided with shielding for electromagnetic interference (“EMI”) by covering at least part of the component with a layer of electrical insulation that conforms to the shape of the surface to which the insulation is applied. At least part of the surface of the insulation is then covered by a layer of EMI shielding that conforms to the shape of the surface of the insulation to which the shielding is applied.

Abstract: An electronic display includes a display panel, which includes an array of pixels and a driver configured to activate and deactivate the emission of light from each of the pixels in the array. The electronic display also includes a panel driver configured to generate and transmit an emission interrupt signal to the driver, wherein the emission interrupt signal causes the driver to deactivate the emission of light from all pixels in the array for a set period of time prior to a refresh of a line of pixels in the array.

Abstract: Systems, methods, and devices are provided to identify the occurrence, location, and/or severity of a fracture within an integrated circuit, even when the integrated circuit is not accessible to external inspection. One such method includes obtaining a measurement of a property of the integrated circuit through at least one contact of the integrated circuit. The measurement may include a resistance of a resistive pattern in the integrated circuit or a measurement of current-voltage behavior of a power supply of the integrated circuit. The measurement of the property may be compared to an expected baseline property. Based at least in part on this comparison, whether a fracture of the integrated circuit has occurred and a location of the fracture in the integrated circuit may be determined.

Abstract: Methods and devices for reducing a voltage difference between common voltage layers (VCOMs) of a display are provided. In one example, a method may include supplying an activation signal to a row of pixels of the display to activate the row of pixels. The method may also partially removing the activation signal from the row of pixels at a predetermined rate. The method may include detecting a voltage difference between a first VCOM of a first set of pixels of the display and a second VCOM of a second set of pixels of the display after the activation signal has been partially removed. The method may also include controlling removal of the activation signal from the row of pixels based at least partially on the detected voltage difference.

Abstract: Methods and devices employing zero-bias display turn-off circuitry, including turn-off logic and switching devices, are provided. In one example, a method may include supplying a common voltage output of ground to a common electrode of a pixel of an electronic display, supplying an activation signal to the pixel to activate the pixel, supplying a data signal of ground to a pixel electrode of the pixel, and removing the activation signal from the pixel while the data signal is being supplied to the pixel to store the data signal in the pixel. When the activation signal is removed, the method may include causing the common voltage output being supplied to the common electrode of the pixel to change to a floating value to prevent a kickback voltage from affecting the data signal stored in the pixel.

Abstract: An apparatus configured to create a resistive pathway for an electronic assembly is disclosed. In one embodiment, the pathway can be formed with a resistive film in conjunction with a conductive adhesive and a coverlay. In another embodiment, the resistive film, the conductive adhesive and the coverlay can be relatively transparent. In yet another embodiment, the resistive pathway can couple directly with traces on an electronic assembly saving space and easing assembly.

Abstract: Disclosed embodiments relate to a display temperature detection system that can detect temperature variations in different regions of a display panel. The temperature measuring display system includes a display panel that provides graphical images. Further, the temperature measuring display system includes temperature measurement circuitry. The temperature measurement circuitry includes one or more thermal diodes, transistors, or a mesh layer useful to determine at least one temperature measurement of the display panel.