Patent application number | Description | Published |
20110227955 | KICKBACK COMPENSATION TECHNIQUES - A technique for reducing the kickback voltage error between two or more common voltage signal lines in a display device is provided. The kickback voltage error may be caused by driving a first and second common voltage at different levels. In one embodiment, a common voltage offset may be applied to the second common voltage such that the magnitude of the voltage kickback error is approximately equalized at the maximum and minimum pixel voltages for pixels coupled to the second common voltage. A data voltage offset, which may be determined based upon gray level data, may be applied to the data voltage supplied to the pixels coupled to the second common voltage. The foregoing technique may compensate for the kickback voltage error between the first and second common voltage lines, thereby reducing visual artifacts and improving color accuracy of the display. | 09-22-2011 |
20110267283 | Kickback Voltage Equalization - Scanning gate lines in a gate driver system of a touch screen is provided. The gate driver system can include gate lines connected to display pixel transistors, a display driver that can generate first and second gate clock signals including first and second voltage transitions, respectively, and a gate drivers that can receive the first and second gate clock signals via gate clock lines and that can apply gate line signals, based on the gate clock signals, to the gate lines. A first voltage change generated in a common electrode line of the touch screen by the first voltage transition can be reduced by a second voltage change generated in the common electrode by the second voltage transition. | 11-03-2011 |
20120019492 | DISPLAY BRIGHTNESS CONTROL BASED ON AMBIENT LIGHT LEVELS - Methods and devices are provided for controlling the brightness of a display for an electronic device based on ambient light conditions. In one embodiment, an electronic device may employ one or more brightness adjustment profiles for changing the brightness of a display based on the ambient light level. The brightness adjustment profiles may include two or more sections, each corresponding to different ambient light levels, which may be adjusted independently of one another. The different sections may allow a user to customize brightness adjustments for different ambient light conditions. In certain embodiments, the slope and/or offset of a section may be adjusted in response to receiving a user input that changes the brightness setting for a certain ambient light level. | 01-26-2012 |
20120113154 | COLUMN INVERSION TECHNIQUES FOR IMPROVED TRANSMITTANCE - Present techniques involve methods and systems of inversion patterns for pixels in a display. Inversion techniques involve driving image signals having a first polarity to data lines of a pixel matrix during a first time period and driving image signals having an opposite polarity to the data lines during a second time period. In some embodiments, the pixels may be configured to have electrodes having only two finger electrodes, thus widening the distance between electrodes and decreasing the susceptibility for crosstalk between pixels. In some embodiments, horizontal cross-talk of electromagnetic fields between pixels may be further reduced by configuring the data line driving scheme such that voltage polarity is flipped for the pixels along every two, three, or more data line columns. Furthermore, a Z inversion pattern may be employed to reduce the occurrence of undesirable display artifacts. | 05-10-2012 |
20120162090 | RELAY DRIVING OF DISPLAYS - Multiple Vcom segments of display screens can be driven in a relay fashion, such that the driving of different Vcom segments overlaps. For example, a Vcom signal can be applied to a first segment of Vcom, and lines of display pixels in the first segment can be scanned. When scanning nears the end of the first segment, a Vcom signal can be applied to the next segment of Vcom before scanning in the first segment ends. For example, when the second-to-the-last line of display pixels in a segment of Vcom is scanned, the next Vcom segment can be driven with a Vcom signal Likewise, when scanning in the next segment of Vcom begins, the Vcom signal can continue to be applied to the first segment of Vcom until a few lines of display pixels in the next segment have been scanned. | 06-28-2012 |
20120162121 | SLEW RATE AND SHUNTING CONTROL SEPARATION - Setting a slew rate, e.g., a rising time or a falling time, of a scanning signal can be performed with a first operation, and a shunting resistance of the scanning line can be set with a second operation. A scanning system that scans a display screen, a touch screen, etc., can set a desired slew rate during a first period of time and can set a desired shunting resistance during a second period of time. A gate line system can sequentially scan gate lines to display an image during a display phase of a touch screen. The gate line system can, for example, increase the falling times of gate line signals. After the falling gate line signal has stabilized, for example, the gate line system can decrease the shunting resistance of the gate line. | 06-28-2012 |
20120299803 | PIXEL-TO-PIXEL COUPLING IN DISPLAYS - Shunt structures, such as shunt lines, that can be positioned between two adjacent pixel electrodes in different rows of display pixels in a display screen are provided. A conductive shunt structure between two pixel electrodes can be configured for reducing a capacitive coupling between the pixel electrodes. The shunt structure can be connected to a voltage source, such as ground, an AC ground, etc. In this way, for example, a pixel-to-pixel capacitance between adjacent pixel electrodes can be reduced. | 11-29-2012 |
20120299892 | CHANGING DISPLAY ARTIFACTS ACROSS FRAMES - Displaying an image on a display screen is provided by periodically changing the scanning order in which rows of sub-pixels of the display screen are scanned. One scanning order can be selected to scan the rows in the update of a first image frame of the display, and then a different scanning order can be selected to scan the rows in the update of a second image frame. Particular scanning orders can be selected in order to reduce or eliminate the appearance of visual artifacts by changing the location of the visual artifacts across multiple image frames. For example, different scanning orders that result in visual artifacts at different positions on the display screen can be used, and the selection of scanning order can periodically change among the different scanning orders such that the position of the visual artifacts changes periodically during the updating of multiple image frames. | 11-29-2012 |
20120299894 | PRE-CHARGING OF SUB-PIXELS - Pre-charging display screen sub-pixels, such as aggressor sub-pixels, prior to the application of a target data voltage to the aggressor sub-pixels is provided. In some examples, a target voltage of a sub-pixel in a previous row in the scanning order of the display can be used to pre-charge sub-pixels. The row of sub-pixels to be pre-charged can be switched on during the updating of another row of sub-pixels. In this way, for example, target voltages applied to data lines while an update row is connected to the data lines, e.g., to update the update row, can be applied to the row to be pre-charged as well. | 11-29-2012 |
20120299900 | SCANNING ORDERS IN INVERSION SCHEMES OF DISPLAYS - Updating an image of a display is provided by scanning rows of sub-pixels of the display by applying voltages to pixel electrodes of adjacent sub-pixels in different lines such that polarity changes in opposite directions can occur in two sub-pixels that are adjacent to a particular sub-pixel. In one example, a positive-polarity voltage can be applied to one sub-pixel that is adjacent to a particular sub-pixel, causing a swing in the polarity of the sub-pixel from negative to positive. A negative-polarity voltage can be applied to another sub-pixel that is adjacent to the particular sub-pixel, swinging the polarity of the pixel electrode from positive to negative. A change in brightness of the particular sub-pixel that may result from a voltage swing one direction in an adjacent sub-pixel may be offset by a change in brightness of the particular sub-pixel that may result from a voltage swing in another adjacent sub-pixel. | 11-29-2012 |
20120299970 | APPLICATION OF VOLTAGE TO DATA LINES DURING VCOM TOGGLING - With respect to liquid crystal display inversion schemes, a large change in voltage on a data line can affect the voltages on adjacent floating data lines due to capacitive coupling between data lines. The change in voltage on these floating data lines can be increased when the application of voltage to the data line occurs after a toggling operation of the Vcom, i.e., when a voltage applied to the Vcom changes the voltage on the Vcom from one polarity to an opposite polarity. Various embodiments of the present disclosure serve to eliminate or reduce the effects of Vcom voltage toggling on data line voltages by applying a voltage (e.g., a fixed voltage) to the data lines while the voltage on Vcom toggles. | 11-29-2012 |
20120299971 | ADDITIONAL APPLICATION OF VOLTAGE DURING A WRITE SEQUENCE - With respect to liquid crystal display inversion schemes, a large change in voltage on a data line can affect the voltages on adjacent data lines due to capacitive coupling between data lines. The resulting change in voltage on these adjacent data lines can give rise to visual artifacts in the data lines' corresponding sub-pixels. Various embodiments of the present disclosure serve to prevent or reduce these visual artifacts by applying voltage to a data line more than once during the write sequence. Doing so can allow erroneous brightening or darkening caused by large voltage swings to be overwritten without causing additional large voltage swings on the data line. | 11-29-2012 |
20120299972 | OFFSETTING MULTIPLE COUPLING EFFECTS IN DISPLAY SCREENS - Design criteria of display screens is provided that can be used in combination with particular inversion schemes and scanning orders of the display screens to reduce or eliminate visual artifacts that can be caused by the effects of capacitive coupling of voltage changes in one part of the display into other parts of the display. Using particular combinations of inversion schemes and scanning orders, together with particular design criteria for the display screen, can allow one type of effect, e.g., an increase or decrease in a brightness of a display pixel, caused by one type of coupling effect, such as a coupling between data lines, can be offset by the effect caused by another type of coupling effect, such as a coupling between pixel electrodes. | 11-29-2012 |
20120299983 | WRITING DATA TO SUB-PIXELS USING DIFFERENT WRITE SEQUENCES - With respect to liquid crystal display inversion schemes, a large change in voltage on a data line can affect the voltages on adjacent data lines due to capacitive coupling between data lines. The resulting change in voltage on these adjacent data lines can give rise to visual artifacts in the data lines' corresponding sub-pixels. Various embodiments of the present disclosure serve to prevent or reduce persisting visual artifacts by offsetting their effects or by distributing their presence among different colored sub-pixels. In some embodiments, this may be accomplished by using different write sequences during the update of a row of pixels. | 11-29-2012 |
20130241900 | SYSTEMS AND METHODS FOR ADJUSTING LIQUID CRYSTAL DISPLAY WHITE POINT USING COLUMN INVERSION - Systems, methods, and devices for adjusting a white point of a liquid crystal display (LCD) using column inversion are provided. In one example, a method includes measuring white points of an electronic display that occur when the display employs different column inversion schemes. The display may be programmed to perform the column inversion scheme that produces a white point closest to a desired white point. | 09-19-2013 |
20130241901 | SYSTEMS AND METHODS FOR LIQUID CRYSTAL DISPLAY COLUMN INVERSION USING 2-COLUMN DEMULTIPLEXERS - Systems, methods, and devices for performing column inversion using 2-column demultiplexers are provided. In one example, an electronic display may include a display panel with columns of pixels configured to be programmed with frames of image data and display driver circuitry. The display driver circuitry may include three demultiplexers, each respectively coupled to one pixel column of a first superpixel and one pixel column of a second superpixel. Each of the three demultiplexers may receive amplified image data of a single polarity per frame. | 09-19-2013 |
20130241958 | SYSTEMS AND METHODS FOR LIQUID CRYSTAL DISPLAY COLUMN INVERSION USING 3-COLUMN DEMULTIPLEXERS - Systems, methods, and devices for column inversion are provided. In one example, an electronic display may include a display panel having columns of pixels and display driver circuitry. The display driver circuitry may include source amplifiers and demultiplexers. Each demultiplexer may channel data output by at least one source amplifier to one of three columns of pixels. The display driver circuitry may drive the display panel according to a 3-column inversion scheme using one source amplifier per demultiplexer per frame of image data. | 09-19-2013 |
20130241959 | SYSTEMS AND METHODS FOR REDUCING LOSS OF TRANSMITTANCE DUE TO COLUMN INVERSION - Systems, methods, and devices for reducing the loss of transmittance caused by column inversion. To provide one example, an electronic display may include a display panel with columns of pixels and driver circuitry to drive the pixels using column inversion. Adjacent columns that are driven at like polarity are spaced more closely than adjacent columns driven at opposite polarities. | 09-19-2013 |
20130241960 | SYSTEMS AND METHODS FOR LIQUID CRYSTAL DISPLAY COLUMN INVERSION USING REORDERED IMAGE DATA - Systems, methods, and devices for performing column inversion using reordered image data are provided. In one example, an electronic display may include a display panel with columns of pixels and driver circuitry to drive the pixels using column inversion. The driver circuitry may drive pixels of a first superpixel in a first color order and drive pixels of an adjacent second superpixel in a second color order, such that more pixels are driven sequentially at a common polarity than would have been driven sequentially at the common polarity were the pixels of the first superpixel driven at the same color order as the pixels of the second superpixel. | 09-19-2013 |
20130278581 | DEVICES AND METHODS FOR PIXEL DISCHARGE BEFORE DISPLAY TURN-OFF - Methods and devices employing circuitry for quickly discharging pixels of a display before the display is turned off are provided. In one example, a method may include receiving at the electronic display a signal indicating the electronic display will be powered off within a period of time. The method may also include, in response to the signal, causing a frame of pixel data originating from the electronic display to be stored in pixels of the electronic display before the electronic display is powered off. Storing the frame of pixel data in the pixels may inhibit image artifacts from occurring on the electronic display when the electronic display is powered back on in the future. | 10-24-2013 |
20130314447 | Method and Apparatus for Display Calibration - A calibration system may be provided for calibrating displays in electronic devices during manufacturing. The calibration system may include calibration computing equipment and a test chamber having a light sensor. The calibration computing equipment may be configured to operate the light sensor and the display to gather display intensity performance data for obtaining a display gamma model. The display intensity performance data may be gathered using a range of display control settings that will be used in performing color calibration operations for the display. The calibration computing equipment may be configured to operate the light sensor and the display to gather display color performance data for determining a display white point calibration. Display white point calibration data may be provided to the electronic device and stored in volatile or non-volatile memory in the device or may be permanently stored in circuitry associated with the display. | 11-28-2013 |
20130328576 | MEASUREMENT OF TRANSISTOR GATE SOURCE CAPACITANCE ON A DISPLAY SYSTEM SUBSTRATE USING A REPLICA TRANSISTOR - Better performance can be provided for a display system that has semiconductor microelectronic components such as demultiplexors, gate line and data line drivers, and pixel switches formed on the display substrate, e.g., a glass substrate that constitutes part of an active matrix display panel. A gate source capacitance of a constituent transistor of one of these microelectronic components, e.g., a pixel thin film transistor (TFT) that is part of a particular display element, may be measured using a replica component that emulates the behavior of the component. | 12-12-2013 |
20130328749 | VOLTAGE THRESHOLD DETERMINATION FOR A PIXEL TRANSISTOR - A display is disclosed that includes a transparent substrate and a plurality of pixel transistors that are formed on the transparent substrate to generate an image for display. A transistor drive circuit is used to drive the pixel transistors to generate the image. The transistor drive circuit may include a gate driver. Further, a test circuit may be used to: adjust voltages that are applied by the gate driver to a pixel transistor; and determine the voltage of the gate driver when a current spike has occurred to the pixel transistor which causes the pixel transistor to turn on. Once this threshold voltage for the gate driver to turn on the pixel transistor has been determined, it may be stored in a storage device for future use by the gate driver. Other embodiments are also described and claimed. | 12-12-2013 |
20130328755 | Systems and Methods for Reducing or Eliminating Mura Artifact Using Contrast Enhanced Imagery - 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. | 12-12-2013 |
20130328759 | Systems and Methods for Mura Calibration Preparation - Systems and methods for calibrating an electronic display to reduce or eliminate artifacts are provided. One method for reducing or eliminating artifacts may involve baking the operational—but not yet fully calibrated—electronic display to reduce stray charge on the electronic display. After baking the display, the electronic display may be calibrated to reduce or eliminate flicker and/or mura artifacts | 12-12-2013 |
20130328795 | DEVICES AND METHODS FOR IMPROVING IMAGE QUALITY IN A DISPLAY HAVING MULTIPLE VCOMS - 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. | 12-12-2013 |
20130328796 | DEVICES AND METHODS FOR REDUCING POWER USAGE OF A TOUCH-SENSITIVE DISPLAY - Methods and devices employing circuitry for reducing power usage of a touch-sensitive display are provided. In one example, a method includes receiving power for a display of an electronic device. The method also includes powering a touch subsystem and a display subsystem of the display. The method includes, in a standard display mode, storing a frame of data in pixels of the display subsystem during a first period of time. The method also includes, in a low power display mode, storing a frame of data in pixels of the display subsystem during a second period of time. The second period of time is not equal to the first period of time. The method includes detecting a touch of the display via the touch subsystem between each synchronization signal of a plurality of synchronization signals received by the display. | 12-12-2013 |
20130328797 | DEVICES AND METHODS FOR REDUCING POWER USAGE OF A TOUCH-SENSITIVE DISPLAY - Methods and devices employing circuitry for reducing power usage of a touch-sensitive display are provided. In one example, a method for reducing power usage of a touch-sensitive display may include receiving power for the display of an electronic device. The method may also include powering a touch subsystem and a display subsystem of the display. The method may include, in a standard display mode, receiving synchronization signals at a first rate. A frame of data is stored on pixels of the display subsystem between each synchronization signal. The method may also include, in a low power display mode, receiving synchronization signals at a second rate. The second rate is less than the first rate. The method may include detecting a touch of the display via the touch subsystem between each synchronization signal. | 12-12-2013 |
20130328799 | CONDITION BASED CONTROLS FOR A DISPLAY - A system, method, and device for increasing uniformity between displays incorporating components from different manufacturers. Incorporating components from different manufactures in different displays may cause the different displays to appear differently even under similar conditions. By modifying the operating parameters used to drive the display according to performance characteristics for various conditions, displays incorporating components from different manufacturers may be configured to produce a substantially similar picture under similar conditions. The various conditions may include stimulus information, such as temperature or touch activity. | 12-12-2013 |
20130328843 | Systems and Methods for Reducing or Eliminating Mura Artifact Using Image Feedback - 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. | 12-12-2013 |
20130328846 | CHARACTERIZATION OF TRANSISTORS ON A DISPLAY SYSTEM SUBSTRATE USING A REPLICA TRANSISTOR - Better performance can be provided for a display system that has semiconductor microelectronic components such as demultiplexors, gate line and data line drivers, and pixel switches formed on the display substrate, e.g., a glass substrate that constitutes part of an active matrix display panel. A constituent transistor of one of these microelectronic components, e.g., a pixel thin film transistor (TFT) that is part of a particular display element, may be characterized using a replica component that emulates the behavior of the component. | 12-12-2013 |
20130328847 | DEVICES AND METHODS FOR COMMON ELECTRODE MURA PREVENTION - Methods and devices employing mura prevention circuitry, are provided. In one example, a method may include supplying a first voltage pathway between a common electrode driver and a common electrode of an electronic display device and supplying a second voltage pathway between the common electrode driver and ground. Mura prevention circuitry may be supplied that activates the first voltage pathway when the electronic display device is turned on and an activation gate signal is provided from a gate corresponding to the common electrode driver. Further, the mura prevention circuitry may activate the second voltage pathway when the electronic display device is turned off or no activation gate signal is provided from the gate corresponding to the common electrode driver. | 12-12-2013 |
20130328852 | MEASUREMENT OF TRANSISTOR THRESHOLD VOLTAGE ON A DISPLAY SYSTEM SUBSTRATE USING A REPLICA TRANSISTOR - Better performance can be provided for a display system that has semiconductor microelectronic components such as demultiplexors, gate line and data line drivers, and pixel switches formed on the display substrate, e.g., a glass substrate that constitutes part of an active matrix display panel. A threshold voltage of a constituent transistor of one of these microelectronic components, e.g., a pixel thin film transistor (TFT) that is part of a particular display element, may be measured using a replica component that emulates the behavior of the component. | 12-12-2013 |
20130328952 | Differential VCOM Resistance or Capacitance Tuning for Improved Image Quality - Devices and methods for reducing a variation in voltage perturbation between common voltage layers (VCOMs) of a display in response to voltage interference are provided. In one example, a resistive element may be coupled to one of several VCOMs to increase the resistance value of the VCOM. The resistive element may cause a variation in voltage perturbations between the several VCOMs to become generally more uniform, thereby reducing or eliminating certain image artifacts. | 12-12-2013 |
20130329057 | Systems and Methods for Dynamic Dwelling Time for Tuning Display to Reduce or Eliminate Mura Artifact - 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. | 12-12-2013 |
20140132585 | DEVICES AND METHODS FOR REDUCING POWER CONSUMPTION OF A DEMULTIPLEXER - The present disclosure relates to devices and methods for reducing power consumption of a display. One electronic display includes a first switch coupled between a first gate of a first transistor and a second gate of a second transistor to selectively connect the first gate to the second gate. The display includes a second switch coupled between the second gate of the second transistor and a third gate of a third transistor to selectively connect the second gate to the third gate. The display also includes driving circuitry that controls the first switch to connect the first gate to the second gate to share a first charge between the first and second gates. The driving circuitry also controls the second switch to connect the second gate to the third gate to share a second charge between the second and third gates. Accordingly, power consumption of the display may be reduced. | 05-15-2014 |
20140139415 | DISPLAY DRIVER PRECHARGE CIRCUITRY - Systems and methods for efficiently generating display driver timing signals are provided. In one example, display driver circuitry of an electronic display may provide a negative voltage from a negative voltage supply to display control circuitry during a first period and may provide a positive voltage from a positive voltage supply to the display control circuitry during a second period. After providing the negative voltage during the first period but before providing the positive voltage during the second period, the display driver circuitry may precharge the capacitance of the display control circuitry to ground. In this way, the positive voltage supply substantially does not supply charge to raise the voltage on the capacitance of the display control circuitry from the negative voltage to ground. | 05-22-2014 |
20140232626 | DISPLAY PANEL SOURCE LINE DRIVING CIRCUITRY - An electronic display system has a light transmissive panel, a region of display elements on the panel, and source lines coupled to the display elements. A demultiplexor circuit has multiple groups of pass gates. Each pass gate has a pair of complimentary on-panel transistors, and the signal outputs of each group are connected to a respective group of the source lines. A display driver integrated circuit (IC) receives video data and timing control signals. A signal input of each group of pass gates is connected to a respective output pin of the driver IC. The display driver IC provides digital timing control signals to control the pass gates of the demultiplexor circuit. Other embodiments are also described. | 08-21-2014 |
20140293144 | Electronic Device Display With Shielding Layer - A display may have a color filter layer and a thin-film transistor layer. A layer of liquid crystal material may be located between the color filter layer and the thin-film transistor layer. A transparent conductive shielding layer may be formed on the lower surface of the thin-film transistor layer. Grounding structures may ground the transparent conductive shielding layer to a ground. The ground may be formed form metal traces on a flexible printed circuit. The display may have a backlight unit. Light-emitting diodes may be used to provide backlight for the backlight unit. The light-emitting diodes may be mounted on the flexible printed circuit. The grounding structures may be formed from a rectangular ring-shaped conductive tape or other conductive structures. | 10-02-2014 |
20150015559 | LIQUID CRYSTAL DISPLAY USING DEPLETION-MODE TRANSISTORS - Methods and devices employing charge removal circuitry are provided to reduce or eliminate artifacts due to a bias voltage remaining on an electronic display after the display is turned off. In one example, a method may include connecting a pixel electrode of a display to ground through charge removal circuitry while the display is off (e.g., using depletion-mode transistors that are active when gates of the depletion-mode transistors are provided a ground voltage). When a corresponding common electrode is also connected to ground, a voltage difference between the pixel electrode and common electrode may be reduced or eliminated, preventing a bias voltage from causing display artifacts in the pixel. | 01-15-2015 |