| Ignis Innovation Inc. Patent applications |
| Patent application number | Title | Published |
|---|
| 20120013581 | METHOD AND SYSTEM FOR DRIVING AN ACTIVE MATRIX DISPLAY CIRCUIT - A method and system for driving an active matrix display is provided. The system includes a drive circuit for a pixel having a light emitting device. The drive circuit includes a drive transistor for driving the light emitting device. The system includes a mechanism for adjusting the gate voltage of the drive transistor. | 01-19-2012 |
| 20120007842 | METHOD AND SYSTEM FOR PROGRAMMING AND DRIVING ACTIVE MATRIX LIGHT EMITTING DEVICE PIXEL HAVING A CONTROLLABLE SUPPLY VOLTAGE - Method and system for programming and driving active matrix light emitting device pixel is provided. The pixel is a voltage programmed pixel circuit, and has a light emitting device, a driving transistor and a storage capacitor. The pixel has a programming cycle having a plurality of operating cycles, and a driving cycle. During the programming cycle, the voltage of the connection between the OLED and the driving transistor is controlled so that the desired gate-source voltage of a driving transistor is stored in a storage capacitor. | 01-12-2012 |
| 20120001888 | VOLTAGE PROGRAMMED PIXEL CIRCUIT, DISPLAY SYSTEM AND DRIVING METHOD THEREOF - A voltage programmed pixel circuit, display system having the pixel circuit and driving method thereof is provided. The pixel circuit includes a light emitting device, a driving transistor connected to the light emitting device and a programming circuit. The programming circuit adjusts a pixel current during a programming cycle of the pixel circuit. | 01-05-2012 |
| 20110279488 | OLED LUMINANCE DEGRADATION COMPENSATION - A system and method are disclosed for determining a pixel capacitance. The pixel capacitance is correlated to a pixel age to determine a current correction factor used for compensating the pixel drive current to account for luminance degradation of the pixel that results from the pixel aging. | 11-17-2011 |
| 20110272695 | PIXEL HAVING AN ORGANIC LIGHT EMITTING DIODE AND METHOD OF FABRICATING THE PIXEL - A pixel having an organic light emitting diode (OLED) and method for fabricating the pixel is provided. A planarization dielectric layer is provided between a thin-film transistor (TFT) based backplane and OLED layers. A through via between the TFT backplane and the OLED layers forms a sidewall angle of less than 90 degrees to the TFT backplane. The via area and edges of an OLED bottom electrode pattern may be covered with a dielectric cap. | 11-10-2011 |
| 20110248980 | CIRCUIT AND METHOD FOR DRIVING AN ARRAY OF LIGHT EMITTING PIXELS - A technique for driving a column of pixels that include light emitting elements. The technique incorporates feedback data provided from feedback data sources connected to the data line and to feedback line of the array, pixel driving circuit with feedback path. The technique can also include block of the reference elements for input signal corrections. | 10-13-2011 |
| 20110227964 | LIFETIME UNIFORMITY PARAMETER EXTRACTION METHODS - A system and method for deriving a sequence of OLED non-uniformity test patterns. A pattern generator generates a full sequence of display patterns according to a transform function, such as a discrete cosine transformation or wavelet transformation. A driver drives a display with each of the sequence of patterns. A sensor senses a property of the display, such as a total current for the display, for each of the sequence of patterns. An extraction unit derives a pixel non-uniformity model using the sensed properties and an inverse of the transform function. Patterns that contribute less than a threshold amount to the non-uniformity model can be identified and deleted to derive a sparse sequence of patterns, which can be stored in a memory. The sparse sequence of patterns can be used to test the display and extract a set of pixel non-uniformity values. The pixel non-uniformity values can be used to generate a correction signal for the display. | 09-22-2011 |
| 20110199395 | SYSTEM AND METHOD FOR COMPENSATION OF NON-UNIFORMITIES IN LIGHT EMITTING DEVICE DISPLAYS - A system and method for operating a display at a constant luminance even as some of the pixels in the display are degraded over time. Each pixel in the display is configured to emit light when a voltage is supplied to the pixel's driving circuit, which causes a current to flow through a light emitting element. Degraded pixels are compensated by supplying their respective driving circuits with greater voltages. The display data is scaled by a compression factor less than one to reserve some voltage levels for compensating degraded pixels. As pixels become more degraded, and require additional compensation, the compression factor is decreased to reserve additional voltage levels for use in compensation. | 08-18-2011 |
| 20110193834 | PIXEL DRIVER CIRCUIT AND PIXEL CIRCUIT HAVING THE PIXEL DRIVER CIRCUIT - A pixel driver circuit for driving a light-emitting element and a pixel circuit having the pixel driver circuit are provided. The pixel driver circuit includes a data line, address lines, switch thin film transistors, feedback thin film transistors and drive thin film transistors. The pixel circuit may include an organic light emitting diode, which is driven by the pixel driver circuit. | 08-11-2011 |
| 20110191042 | SYSTEM AND METHODS FOR EXTRACTING CORRELATION CURVES FOR AN ORGANIC LIGHT EMITTING DEVICE - A system and method for determining and applying characterization correlation curves for aging effects on an organic light organic light emitting device (OLED) based pixel is disclosed. A first stress condition is applied to a reference pixel having a drive transistor and an OLED. An output voltage based on a reference current is measured periodically to determine an electrical characteristic of the reference pixel under the first predetermined stress condition. The luminance of the reference pixel is measured periodically to determine an optical characteristic of the reference pixel. A characterization correlation curve corresponding to the first stress condition including the determined electrical and optical characteristic of the reference pixel is stored. Characterization correlation curves for other predetermined stress conditions are also stored based on application of the predetermined stress conditions on other reference pixels. The stress condition of an active pixel is determined and a compensation voltage is determined by correlating the stress condition of the active pixel with the curves of the predetermined stress conditions. | 08-04-2011 |
| 20110141160 | COMPENSATION TECHNIQUE FOR LUMINANCE DEGRADATION IN ELECTRO-LUMINANCE DEVICES - A method and system for compensation for luminance degradation in electro-luminance devices is provided. The system includes a pixel circuit having a light emitting device, a storage capacitor, a plurality of transistors, and control signal lines to operate the pixel circuit. The storage capacitor is connected or disconnected to the transistor and a signal line(s) when programming and driving the pixel circuit. | 06-16-2011 |
| 20110134157 | SYSTEM AND METHODS FOR POWER CONSERVATION FOR AMOLED PIXEL DRIVERS - A circuit and method to improve energy conservation of an AMOLED display. The display includes a matrix of pixels each having an organic light emitting device coupled to a drive transistor. The brightness of the light emitting device is controlled by a programming voltage applied to the gate of the drive transistor. The supply voltage to the drive transistor is adjusted to different levels based on the required brightness of the pixel. Since the drive transistor operates in saturation mode, especially when maximum brightness is desired, the supply voltage may be reduced while maintaining the same brightness level. | 06-09-2011 |
| 20110134094 | SYSTEM AND DRIVING METHOD FOR ACTIVE MATRIX LIGHT EMITTING DEVICE DISPLAY - Active matrix light emitting device display and its driving technique is provided. The pixel includes a light emitting device and a plurality of transistors. A capacitor may be used to store a voltage applied to a driving transistor so that a current through the light emitting device is independent of any shifts of the transistor and light emitting device characteristics. A bias data and a programming data are provided to the pixel circuit in accordance with a driving scheme. | 06-09-2011 |
| 20110130981 | SYSTEM AND METHODS FOR AGING COMPENSATION IN AMOLED DISPLAYS - Methods and systems to provide baseline measurements for aging compensation for a display device are disclosed. An example display system has a plurality of active pixels and a reference pixel. Common input signals are provided to the reference pixel and the plurality of active pixels. The outputs of the reference pixel is measured and compared to the output of the active pixels to determine aging effects. The display system may also be tested applying a first known reference current to a current comparator with a second variable reference current and the output of a device under test such as one of the pixels. The variable reference current is adjusted until the second current and the output of the device under test is equivalent of the first current. The resulting current of the device under test is stored in a look up table for a baseline for aging measurements during the display system operation. The display system may also be tested to determine production flaws by determining anomalies such as short circuits in pixel components such as OLEDs and drive transistors. | 06-02-2011 |
| 20110128262 | HIGH RESOLUTION PIXEL ARCHITECTURE - A high resolution pixel using organic light emitting devices (OLEDs) in a staggered arrangement to increase aperture ratio is disclosed. The arrangement may be used with both bottom and top emission type pixels. The arrangement includes a first organic light emitting device emitting light of a first color. A second organic light emitting device emitting light of a second color is located in a bottom row under the first organic light emitting device. A third organic light emitting device emitting light of a third color is located in a top row with the first organic light emitting device. | 06-02-2011 |
| 20110109612 | SHARING SWITCH TFTS IN PIXEL CIRCUITS - A circuit and driving technique to improve the display resolution of an AMOLED display. Sharing of switch transistors between several sub-pixels in the display leads to improved manufacturing yield by minimizing the number of transistors used. The method also allows for conventional sequential scan driving to be used. The circuit includes a shared switch transistor connected between a voltage data line and a shared line that is connected to a reference voltage through a reference voltage transistor, a first pixel including a first light emitting device configured to be current driven by a first drive circuit connected to the shared line through a first storage device, a second pixel including a second light emitting device configured to be current driven by a second drive circuit connected to the shared line through a second storage device, and a reference current line configured to apply a bias current to the first and second drive circuits. | 05-12-2011 |
| 20110109350 | Stable Current Source for System Integration to Display Substrate - A technique to implement a stable and high impedance current sink or source onto a display substrate using a single device. The high output current source or sink circuit includes an input that receives a fixed reference current and provides the reference current to a node in the current source or sink circuit during a calibration operation of the current source or sink circuit. The circuit further includes a first transistor and a second transistor series-connected to the node such that the reference current adjusts the voltage at the node to allow the reference current to pass through the series-connected transistors during the calibration operation. The circuit includes one or more storage devices connected to the node, and an output transistor connected to the node to source or sink an output current from current stored in the one or more storage devices to a drive an active matrix display with a bias current corresponding to the output current. | 05-12-2011 |
| 20110109299 | Stable Fast Programming Scheme for Displays - A technique for improving the spatial and/or temporal uniformity of a light-emitting display by providing a faster calibration of reference current sources and reducing the noise effect by improving the dynamic range, despite instability and non-uniformity of the transistor devices. A calibration circuit for a display panel having an active area having a plurality of light emitting devices arranged on a substrate, and a peripheral area of the display panel separate from the active area is provided. The calibration circuit includes a first row of calibration current source or sink circuits and a second row of calibration current source or sink circuits. A first calibration control line is configured to cause the first row of calibration current source or sink circuits to calibrate the display panel with a bias current while the second row of calibration current source or sink circuits is being calibrated by a reference current. A second calibration control line is configured to cause the second row of calibration current source or sink circuits to calibrate the display panel with the bias current while the first row of calibration current source or sink circuits is being calibrated by the reference current. | 05-12-2011 |
| 20110069096 | Driving System For Active-Matrix Displays - A system is provided for using raw grayscale image data, representing images to be displayed in successive frames, to drive a display having pixels that include a drive transistor and an organic light emitting device. The system defines high and low ranges of raw grayscale image data, and determines whether the raw grayscale image data for each pixel falls within the high range or the low range. Raw grayscale image data that falls within the low range is converted to higher grayscale values, and the pixels are driven with currents corresponding to the higher grayscale values during time periods that are shorter than complete frame time periods. Raw grayscale image data that falls within the high range is converted to higher grayscale values, and the pixels are driven with currents corresponding to the higher grayscale values during time periods that are shorter than complete frame time periods and different from the time periods of the low range image data. When the raw grayscale image data is adjusted according to a preselected gamma curve before using that data to drive the pixels, the high and low ranges may be selected according to how well the gamma curve corrects the raw grayscale image data within the ranges. | 03-24-2011 |
| 20110012884 | METHOD AND SYSTEM FOR DRIVING A LIGHT EMITTING DEVICE DISPLAY - A method and system for driving a light emitting device display is provided. The system provides a timing schedule which increases accuracy in the display. The system may provide the timing schedule by which an operation cycle is implemented consecutively in a group of rows. The system may provide the timing schedule by which an aging factor is used for a plurality of frames. | 01-20-2011 |
| 20110012883 | METHOD AND SYSTEM FOR PROGRAMMING AND DRIVING ACTIVE MATRIX LIGHT EMITTING DEVICE PIXEL - Method and system for programming and driving active matrix light emitting device pixel is provided. The pixel is a voltage programmed pixel circuit, and has a light emitting device, a driving transistor and a storage capacitor. The pixel has a programming cycle having a plurality of operating cycles, and a driving cycle. During the programming cycle, the voltage of the connection between the OLED and the driving transistor is controlled so that the desired gate-source voltage of a driving transistor is stored in a storage capacitor. | 01-20-2011 |
| 20100315449 | COMPENSATION TECHNIQUE FOR COLOR SHIFT IN DISPLAYS - A system for maintaining a substantially constant display white point over an extended period of operation of a color display formed by an array of multiple pixels in which each of the pixels includes multiple subpixels having different colors, and each of the subpixels includes a light emissive device. The display is generated by energizing the subpixels of successively selected pixels, and the color of each selected pixel is controlled by the relatives levels of energization of the subpixels in the selected pixel. The degradation behavior of the subpixels in each pixel is determined, and the relative levels of energization of the subpixels in each pixel are adjusted to adjust the brightness shares of the subpixels to compensate for the degradation behavior of the subpixels. The brightness shares are preferably adjusted to maintain a substantially constant display white point. | 12-16-2010 |
| 20100207920 | LOW POWER CIRCUIT AND DRIVING METHOD FOR EMISSIVE DISPLAYS - A display system, a driver for driving the display array, method of operating the display system and a pixel circuit in the display system are provided. The driver includes: a bidirectional current source having a convertor coupling to a time-variant voltage, for converting the time-variant voltage to the current. The pixel circuit includes: a transistor for providing a pixel current to a light emitting device; and a storage capacitor electrically coupling to the transistor, the capacitor coupling to a time-variant voltage in a predetermined timing for providing a current based on the time-variant voltage. The method includes: in a first cycle in a programming operation, changing a time-variant voltage provided to a storage capacitor in a pixel circuit, from a reference voltage to a programming voltage, the storage capacitor electrically coupling to a driving transistor for driving a light emitting device; and in a second cycle in the programming operation, maintaining the time-variant voltage at the programming voltage. The method includes: in a programming operation, providing programming data to a pixel circuit from a data line, the pixel circuit including a transistor coupling to the data line and a storage capacitor; and in a driving operation, providing, to the storage capacitor in the pixel circuit via a power supply line, a time-variant voltage for turning on a light emitting device. The pixel circuit, which includes: an organic light emitting diode (OLED) device having an electrode and an OLED layer; and an inter-digitated capacitor having a plurality of layers. | 08-19-2010 |
| 20100039458 | SYSTEM AND DRIVING METHOD FOR LIGHT EMITTING DEVICE DISPLAY - A light emitting device display, its pixel circuit and its driving technique is provided. The pixel includes a light emitting device and a plurality of transistors. A bias current and programming voltage data are provided to the pixel circuit in accordance with a driving scheme so that the current through the driving transistor to the light emitting device is adjusted. | 02-18-2010 |
| 20100039453 | METHOD AND SYSTEM FOR DRIVING LIGHT EMITTING DISPLAY - A display system and its driving method is provided. The system includes: a driver for operating a panel having a plurality of pixels arranged by a plurality of first lines and at least one second line, the driver including: a driver output unit for providing to the panel a single driver output for activating the plurality of first lines, the single driver output being demultiplexed on the panel to activate each first line. The system includes: a driver for operating a panel having a plurality of pixels arranged by a plurality of data lines and at least one scan line, the driver including: a shift register unit including a plurality of shift registers; a latch and shift register unit including a plurality of latch and shift circuits for the plurality of shift registers, each storing an image signal from the corresponding shift register or shifting the image signal to a next latch and shift circuit; and a decoder unit including at least one decoder coupled to one of the latch and shift circuits, for decoding the image signal latched in the one of the latch and shift circuit to provide a driver output. The system includes: a driver for operating a panel having a plurality of pixels, the driver including: a plurality of multiplexers for a plurality of offset gamma curve sections, each offset gamma curve section having a first range less than a second range of a main gamma curve, at least one of offset gamma curve sections being offset by a predetermined voltage from a corresponding section of the main gamma curve; a plurality of decoders for the plurality of multiplexers; and an output buffer for providing a driver output based on the output from the decoder and the predetermined voltage. | 02-18-2010 |
| 20100033469 | METHOD AND SYSTEM FOR PROGRAMMING, CALIBRATING AND DRIVING A LIGHT EMITTING DEVICE DISPLAY - A method and system for programming, calibrating and driving a light emitting device display is provided. The system may include extracting a time dependent parameter of a pixel for calibration. | 02-11-2010 |
| 20090284501 | PIXEL DRIVER CIRCUIT AND PIXEL CIRCUIT HAVING THE PIXEL DRIVER CIRCUIT - A pixel driver circuit for driving a light-emitting element and a pixel circuit having the pixel driver circuit are provided. The pixel driver circuit includes a data line, address lines, switch thin film transistors, feedback thin film transistors and drive thin film transistors. The pixel circuit may include an organic light emitting diode, which is driven by the pixel driver circuit. | 11-19-2009 |
| 20090262101 | PIXEL CIRCUIT, DISPLAY SYSTEM AND DRIVING METHOD THEREOF - A display system and method for the same is provided. A display includes a plurality of pixels, each having a light emitting device and a driving transistor for driving the light emitting device, the driving transistor and the light emitting device being coupled in series between a first power supply and a second power supply. The method includes: at a first frame, programming a pixel with a first programming voltage different from a programming voltage for a valid image, and charging at least one of the first power supply and the second power supply so that at least one of the driving transistor and the light emitting device is under a negative bias. The pixel circuit includes: a light emitting device; a driving transistor for driving the light emitting device, the driving transistor having a gate terminal, a first terminal coupled to the light emitting device, and a second terminal; a storage capacitor; a first switch transistor coupled to a data line for providing a programming data and the gate terminal of the driving transistor; and a second switch transistor for reducing a threshold voltage shift of the driving transistor, the storage capacitor and the second switch transistor being coupled in parallel to the gate terminal of the driving transistor and the first terminal of the driving transistor. The method includes: at a first cycle, implementing an image display operation having programming the pixel circuit for a valid image and driving the light emitting device; and at a second cycle, implementing a relaxation operation for reducing a stress on the pixel circuit, including: selecting a relaxation switch transistor coupled to the storage capacitor in parallel. | 10-22-2009 |
| 20090262046 | HIGH APERTURE RATIO PIXEL LAYOUT FOR DISPLAY DEVICE - A display device, pixel layout and method of forming the same is provided. The display device includes: a plurality of pixels formed in a pixel array area; and a power supply grid for distributing power to the pixels. Each pixel has a light emitting device and a plurality of transistors. The power supply grid includes a first group of power supply lines and a second group of power supply lines. The first group of power supply lines extend across the pixel array area. The second group of power supply lines extends across the pixel array area and electrically contacts the first group of power supply lines in the pixel array area. Each pixel is coupled to at least one power supply line in the first group of power supply lines and the second group of power supply lines. | 10-22-2009 |
| 20090219273 | DISPLAY SYSTEM WITH A SOLAR CELL AND DEVICE HAVING THE SAME - A display system and a device having the display system are provided. The display system includes: a pixel area on which a pixel is formed; a substrate having a top side and a back side opposite to the top side, and a plurality of edges between the top side and the back side, the substrate being a main substrate on which the pixel area being formed or a sealing substrate; and a solar cell area having at least one solar cell integrated on a peripheral of the pixel area, the edge of the substrate or a combination thereof. The display system includes: a pixel area on a display substrate, including: a transparent electrode; and an emissive device for emitting a light, the transparent electrode and the emissive device being aligned in series on the display substrate, a solar cell placed behind the transparent electrode, for making the transparent electrode non-reflective to the emissive device. The device includes: the display system, and a chargeable power source electrically connected to the solar cell for supplying an operation power to the device. | 09-03-2009 |
| 20090212287 | THIN FILM TRANSISTOR AND METHOD FOR FORMING THE SAME - A thin film transistor (TFT) and the method of forming the same is provided. The method of forming the TFT on a surface of a substrate, includes the steps of: forming a gate electrode; deposing a gate dielectric on the gate electrode; forming a nanocrystalline silicon (nc-Si) layer and an amorphous silicon (a-Si:H) layer above the gate dielectric, so that the thickness of the nc-Si layer is less than 30 nm thereby reducing off-current; and forming a source/drain electrode. The TFT includes: a gate electrode on a substrate, a gate dielectric on the gate electrode; a nc-Si layer having a thickness less than 30 nm, thereby reducing off-current; an a-Si:H layer; and a source/drain electrode. | 08-27-2009 |
