Patent application number | Description | Published |
20100109738 | Gate driver and method for making same - A gate driver for use in a liquid crystal display has a plurality of shift registers connected in series. Each of the shift registers is used to provide a gate-line pulse to a row of pixels in the liquid crystal display. The gate-line pulse has a front pulse and a rear pulse and the shift register has a front-pulse generating part and a rear-pulse generating part for generating to corresponding pulse. Each of the pulse generating parts has a first pull-up circuit to generate a voltage level to keep a switching element in a second pull-up circuit conducting so as to generate a front or rear pulse, in response to a corresponding clock signal, and two pull-down circuits, in response to the voltage level, to allow the front or rear pulse to be generated only at a pull-down period. | 05-06-2010 |
20100150302 | SHIFT REGISTER - A shift register comprises a plurality of stages, {S | 06-17-2010 |
20110002437 | SHIFT REGISTERS - A shift register is provided and includes a first shift registering unit and a second shift registering unit. The first shift registering unit generates a first trigger signal at a first output terminal and includes a first pull-down circuit. The second shift registering unit receives the first trigger signal and generates a second trigger signal at a second output terminal. The first trigger signal and the second trigger signal are sequentially asserted. The second shift registering unit includes a second pull-down circuit. The first pull-down circuit and the second pull-down circuit perform pull-down operations at different times. When the first pull-down circuit does not perform the pull-down operation, the second pull-down circuit performs pull-down operations to the first output terminal. | 01-06-2011 |
20110007863 | SHIFT REGISTER - A shift register comprises a plurality of stages, {S | 01-13-2011 |
20110050550 | Pixel driving circuit for light emitting display panel - A display panel has a plurality of OLED pixels arranged in rows and columns. The pixel driving circuit has two or more current paths through a plurality of switching elements for providing the necessary current to the OLEDs in a pixel. The control end of each switching element is connected to the control end of the other switching elements, but each switching element has a separate power source which can be separately adjustable. In some embodiments, in a pixel or sub-pixel, one switching element is located at one end and one switching element is located at the other end of a pixel length, and each pixel is adjacent to a first power source line and a second power source line along the pixel length for separately providing the electrical power to two switching elements. | 03-03-2011 |
20110158376 | SHIFT REGISTER - A shift register comprises a plurality of stages, {S | 06-30-2011 |
20110221720 | AMOLED DISPLAY WITH OPTICAL FEEDBACK COMPENSATION - In one aspect, the present invention relates to a display. In one embodiment, the display has a substrate, and a plurality of pixels formed on the substrate and arranged in an array. Each pixel includes a driving transistor and a read-out transistor spatially formed on the substrate, where each transistor has a gate electrode, a drain electrode and a source electrode, an organic light emitting diode (OLED) having a cathode layer, a anode layer and an emissive layer formed between the cathode layer and the anode layer, and formed over the driving transistor and the read-out transistor such that the anode layer of the OLED is electrically connected to the source electrode of the driving transistor, and a photo sensor having a photosensitive layer formed between the anode layer of the OLED and the source electrode of the read-out transistor. | 09-15-2011 |
20120008732 | SHIFT REGISTER WITH LOW POWER CONSUMPTION - A shift register comprising a plurality of shift register stages {S | 01-12-2012 |
20120140872 | SHIFT REGISTER WITH LOW POWER CONSUMPTION - A shift register comprising a plurality of shift register stages {S | 06-07-2012 |
20120213323 | SHIFT REGISTER WITH LOW POWER CONSUMPTION - A shift register comprising a plurality of shift register stages {S | 08-23-2012 |
20140055434 | ORGANIC LIGHT-EMITTING DIODE DISPLAY AND METHOD OF DRIVING SAME - In one aspect of the invention, a method of driving an OLED display includes providing scan signals and data signals and applying the scan signals to scan lines and the data signals to the data lines, respectively. Each scan signal is characterized with a waveform having a compensation duration and a scan duration immediately following the compensation duration. The waveform has a first voltage and a second voltage periodically and alternately varied from one another defining a period in the compensation duration, and has the first voltage in the scan duration. The period is equal to the scan duration but shorter than the compensation duration. As such, during the compensation duration of a scan signal, pixels of a corresponding pixel row are charged for compensation, and during the scan duration, the data signals are written into the pixels of the corresponding pixel row for driving the OLEDs thereof. | 02-27-2014 |
20140125643 | AMOLED DISPLAY WITH OPTICAL FEEDBACK COMPENSATION - In one aspect of the invention, a display includes a substrate, and a plurality of pixels formed on the substrate and arranged in an array. Each pixel has a driving transistor having a gate electrode, a drain electrode and a source electrode, formed on the substrate, an organic light emitting diode (OLED) having a cathode layer, a anode layer and an emissive layer formed between the cathode layer and the anode layer, and formed over the driving transistor such that the anode layer of the OLED is electrically connected to the source electrode of the driving transistor, a bias electrode formed over the substrate, and a photo sensor having a photosensitive layer formed between the anode layer of the OLED and the bias electrode. | 05-08-2014 |
Patent application number | Description | Published |
20090304138 | SHIFT REGISTER AND SHIFT REGISTER UNIT FOR DIMINISHING CLOCK COUPLING EFFECT - A shift register and a shift register unit for diminishing clock coupling effect are introduced herein. Each stage shift register unit includes at least one pull-up driving module, a pull-up module, at least one pull-down module and a pull-down driving module. Before a waveform of either a first clock signal or a second clock signal employed by the pull-up module transits into a rising edge, the pull-down driving module employs a first periodic signal to turn on the pull-down module in advance for a specific period, and/or before the waveform of the first or second clock signal employed by the pull-up module transits into a falling edge, the pull-down driving module employs a second periodic signal to turn off the pull-down module in advance for a specific period. Accordingly, the pull-down module can gain a sufficient capability against the clock coupling effect so as to optimize the waveform outputted from the shift register unit. | 12-10-2009 |
20090304139 | SHIFT REGISTER - A shift register includes a plurality of register units cascade-connected with each other. Each register unit includes a pull-up circuit, a pull-up driving circuit, a pull-down circuit, and a pull-down driving circuit. The pull-up circuit coupled to a first clock signal is used for providing an output signal. The pull-up driving circuit turns on in response to a driving pulse from a previous register unit and a second clock signal, and turns off in response to a third clock signal. The pull-down driving circuit which is coupled to an input node of the pull-down circuit, turns on in response to a first clock signal, and turns off in response to a the first clock signal or output of the pull-up driving circuit. | 12-10-2009 |
20100150303 | SHIFT REGISTER WITH PRE-PULL-DOWN MODULE TO SUPPRESS A SPIKE - A shift register includes a plurality of shift register stages cascade-connected with each other. Each shift register stage includes a pull up module for outputting an output pulse in response to a first clock signal, a pull-up driving module for turning on the pull up module in response to a driving pulse of a previous one stage of the shift register, a pre-pull-down module coupled to a previous two stage of the shift register and a first node for pulling down voltage level of the first node in response to a output pulse of the previous two stage of the shift register, a pull down module coupled to the first node for pulling down voltage level of the first node in response to a pulling-down triggering signal, and a pulling down driving module for providing the pulling-down triggering signal. | 06-17-2010 |
20100226473 | SHIFT REGISTER - A shift register includes multiple cascade-connected stages. Each stage generates an output signal in response to a clock signal and a first control signal. Each stage includes a pull-up module, a pull-up driving module, a first pull-down module, a second pull-down module, and a third pull-down module. The pull-up module is used for providing the output signal based on the clock signal. The pull-up driving module turns on the pull-up module in response to a first control signal. The first pull-down module adjusts voltage level on the first node to a first supply voltage in response to a second control signal. The second pull-down module adjusts voltage level on the output end to a second supply voltage in response to the second control signal. The third pull-down module adjusts voltage level on the second node to a third supply voltage in response to a third control signal. | 09-09-2010 |
Patent application number | Description | Published |
20090146698 | DRIVING CIRCUIT AND A PIXEL CIRCUIT INCORPORATING THE SAME - A driving circuit includes: a switch unit operable according to a scan signal, and adapted for permitting transfer of a data signal when operating in an on state; a capacitor having a first end that is coupled to the switch unit, and a second end; a first transistor having a first terminal that is adapted for coupling to a voltage source, a second terminal that is coupled to the second end of the capacitor and that is adapted to be coupled to a load, and a control terminal that is coupled to the first end of the capacitor; and a second transistor having a first terminal that is adapted for coupling to the voltage source, a second terminal coupled to the second terminal of the first transistor, and a control terminal that is adapted for receiving a bias voltage. Each of the first and second transistors operates in the linear region. | 06-11-2009 |
20100109718 | Driving Circuit, and a Pixel Circuit Incorporating the Same - A driving circuit includes: a switch unit permitting transfer of a data signal when operating in an on state; a capacitor having a first end coupled to the switch unit, and a second end; a first transistor having a first terminal for coupling to a second voltage source, a second terminal coupled to the second end of the capacitor and to a load, and a control terminal coupled to the first end of the capacitor; and a second transistor having a first terminal coupled to the second end of the capacitor, a second terminal receiving a bias voltage, and a control terminal coupled to the first terminal of the second transistor. | 05-06-2010 |
20110156611 | DRIVING DEVICE OF LIGHT EMITTING UNIT - A driving device of a light emitting unit is provided. The driving device includes a driving circuit, a switch, a capacitor, and a compensation circuit. The driving circuit has a control terminal and a driving terminal connected to the light emitting unit. The driving circuit determines a driving current according to the voltage on the control terminal. The switch has a first end for receiving a data voltage, a second end connected to the light emitting unit, and a control end for receiving a scan voltage. The capacitor has a first end connected to the control terminal of the driving circuit and a second end connected to the second end of the switch. The compensation circuit has an output terminal connected to the first end of the capacitor. The compensation circuit supplies a reset voltage to the first end of the capacitor when the switch is turned on. | 06-30-2011 |
20110157147 | DRIVING DEVICE OF LIGHT EMITTING UNIT - A driving device of a light emitting unit is provided, which includes a driving circuit, a memory unit, a reset circuit, a first switch and a compensation circuit. The driving circuit determines a driving current according to a voltage of a control node. The memory unit maintains a voltage of the control node of the driving circuit. The reset circuit provides a reset voltage to the control node of the driving circuit during a reset period. A first node of the first switch receives a data voltage, and the control node of the first switch receives a scan voltage. The compensation circuit is connected between a second node of the first switch and the control node of the driving circuit to transmit the data voltage provided by the first switch to the control node of the driving circuit. | 06-30-2011 |
20110254883 | PIXEL CIRCUIT RELATING TO ORGANIC LIGHT EMITTING DIODE AND DISPLAY USING THE SAME AND DRIVING METHOD THEREOF - A pixel circuit relating to an organic light emitting diode (OLED) and a display using the same and a driving method thereof are provided. The pixel circuit submitted by the present invention adopts a 3T2C architecture (i.e. three TFTs plus two capacitors), and which circuit topology being driven by the corresponding scan signals and data signal may make the luminance shown by the pixel circuit only relate to the data signal and do not relate to the threshold voltage of a transistor used to drive a lighting element (i.e. OLED), a system high voltage received by the pixel circuit, and a potential between an anode and a cathode of the lighting element, such that the problem of non-uniform displaying on the OLED display panel may be improved or resolved effectively. | 10-20-2011 |
20120068983 | SWITCHABLE ORGANIC ELECTRO- LUMINESCENCE DISPLAY PANEL AND SWITCHABLE ORGANIC ELECTRO-LUMINESCENCE DISPLAY CIRCUIT - A switchable organic electro-luminescence display circuit includes a plurality of scan lines, a plurality of data lines, a plurality of first organic electro-luminescence devices, a plurality of second organic electro-luminescence devices, a display mode switching line, and at least one display mode switching transistor. Each of the first organic electro-luminescence devices is electrically connected to a scan line and a data line correspondingly, and coupled between a first voltage source and a second voltage source. Each of the second organic electro-luminescence devices is electrically connected to a scan line and a data line correspondingly, and coupled to the first voltage source. A gate electrode of the display mode switching transistor is electrically connected to the display mode switching line. A source electrode and a drain electrode of the display mode switching transistor are electrically connected to the second voltage source and the second organic electro-luminescence devices respectively. | 03-22-2012 |
20120139819 | ORGANIC LIGHT EMITTING DIODE PIXEL ARRAY - An organic light emitting diode (OLED) pixel array includes a plurality of first signal lines, a plurality of second signal lines, and a plurality of pixel array units. The pixel array units are arranged in array on a substrate. Each of the pixel array units includes a plurality of OLED pixels. The OLED pixels are connected to the same first signal line and respectively connected to a first portion and a second portion of the second signal lines. At least two of the OLED pixels are located between the first portion and the second portion. A transmittance region is surrounded by the first portion, the second portion, and the OLED pixels, and the first portion and the second portion are respectively located at two opposite sides of the transmittance region. | 06-07-2012 |
20130293525 | ORGANIC LIGHT EMITTING DIODE DISPLAY DEVICE AND METHOD FOR DRIVING ORGANIC LIGHT EMITTING DIODE DISPLAY PANEL - An organic light emitting diode (OLED) display device and a method for driving an OLED display panel are provided. The method includes the following steps. In a reset period, a plurality of scanning signals received by a plurality of pixels of the OLED display panel is simultaneously enabled, and a plurality of data-voltages received by the pixels are set to a reference-voltage. In a threshold voltage cancelling period, a system-high-voltage received by the pixels and the scanning signals are simultaneously enabled, and the data-voltages are set to the reference-voltage. In a scanning period, the scanning signals are sequentially enabled, and the data-voltages are set according to the corresponded displaying data within a plurality of displaying data. | 11-07-2013 |
20130314308 | ORGANIC LIGHT EMITTING DISPLAY UNIT STRUCTURE AND ORGANIC LIGHT EMITTING DISPLAY UNIT CIRCUIT - An organic light emitting display unit structure including a first pixel, a second pixel adjacent to the first pixel, a first scan line electrically connected to the first pixel, a second scan line electrically connected to the second pixel, a data line, a power line, a sustaining signal line, a common reset signal line and a common light emitting signal line is provided. The power line and the sustaining signal line are respectively electrically connected to both of the first pixel and the second pixel. The data line intersects with the first scan line and the second scan line and is electrically connected to the first pixel and the second pixel. The common reset signal line and the common light emitting signal line are substantially disposed inside the first pixel and the second pixel respectively and are electrically connected to the first pixel and the second pixel. | 11-28-2013 |
Patent application number | Description | Published |
20150053935 | Organic Light-Emitting Diode Displays With Semiconducting-Oxide and Silicon Thin-Film Transistors - An electronic device may include a display having an array of display pixels on a substrate. The display pixels may be organic light-emitting diode display pixels or display pixels in a liquid crystal display. In an organic light-emitting diode display, hybrid thin-film transistor structures may be formed that include semiconducting oxide thin-film transistors, silicon thin-film transistors, and capacitor structures. The capacitor structures may overlap the semiconducting oxide thin-film transistors. Organic light-emitting diode display pixels may have combinations of oxide and silicon transistors. In a liquid crystal display, display driver circuitry may include silicon thin-film transistor circuitry and display pixels may be based on oxide thin-film transistors. A single layer or two different layers of gate metal may be used in forming silicon transistor gates and oxide transistor gates. A silicon transistor may have a gate that overlaps a floating gate structure. | 02-26-2015 |
20150109276 | Organic Light Emitting Diode Displays with Improved Driver Circuitry - An electronic device may be provided with an organic light-emitting diode display. The display may include row driver circuitry that provides an emission control signal at an output terminal to display pixels. The emission control signals may enable or disable light emission by the pixels. The row driver circuitry may include a bootstrapping capacitor that stores charge for boosting a gate signal at an intermediate node for a pull-up transistor above a power supply voltage. The row driver circuitry may include a pull-down transistor coupled to the intermediate node. The source terminal of the pull-down transistor may be coupled to the output terminal or an additional pull-down transistor may be stacked with the pull-down transistor to reduce leakage current. Charge pump circuitry may be coupled to the intermediate node to ensure that the intermediate node is maintained at a voltage above the power supply voltage. | 04-23-2015 |
20150109279 | Organic Light Emitting Diode Displays with Improved Driver Circuitry - An electronic device may be provided with an organic light-emitting diode display. The display may include row driver circuitry that provides an emission control signal at an output terminal to display pixels. The emission control signals may enable or disable light emission by the pixels. The row driver circuitry may include a bootstrapping capacitor that stores charge for boosting a gate signal at an intermediate node for a pull-up transistor above a power supply voltage. The row driver circuitry may include a pull-down transistor coupled to the intermediate node. The source terminal of the pull-down transistor may be coupled to the output terminal or an additional pull-down transistor may be stacked with the pull-down transistor to reduce leakage current. Charge pump circuitry may be coupled to the intermediate node to ensure that the intermediate node is maintained at a voltage above the power supply voltage. | 04-23-2015 |
20150145849 | Display With Threshold Voltage Compensation Circuitry - A display may have an array of organic light-emitting diode display pixels. Each display pixel may have a light-emitting diode that emits light under control of a drive transistor. Each display pixel may also have control transistors for compensation and programming operations. Each display pixel may have five p-type transistor and two capacitors. One of the five p-type transistors may serve as the drive transistor and may be compensated using the remaining four of the p-type transistors and the two capacitors. A first of the capacitors may be coupled between the gate and source of the drive transistor. A second of the capacitors may have a terminal coupled to the source. Alternatively, each display pixel may have six p-type transistors and a single capacitor. The six p-type transistors may include a drive transistor having a gate coupled to the capacitor. | 05-28-2015 |
20150206931 | Organic Light-Emitting Diode Display with Bottom Shields - A display may have an array of organic light-emitting diode display pixels. Each display pixel may have a light-emitting diode that emits light under control of a drive transistor. Each display pixel may also have control transistors for compensating and programming operations. The array of display pixels may have rows and columns. Row lines may be used to apply row control signals to rows of the display pixels. Column lines (data lines) may be used to apply display data and other signals to respective columns of display pixels. A bottom conductive shielding structure may be formed below each drive transistor. The bottom conductive shielding structure may serve to shield the drive transistor from any electric field generated from the adjacent row and column lines. The bottom conductive shielding structure may be electrically floating or coupled to a power supply line. | 07-23-2015 |
20150310801 | Displays With Overlapping Light-Emitting Diodes and Gate Drivers - An electronic device may be provided with a display. The display may be formed from an array of organic light-emitting diode display pixels. Each display pixel may have an organic light-emitting diode having an anode and a cathode and may have an associated pixel circuit for controlling the light-emitting diode. The anodes may be formed from patches of metal arranged in an array on the display. The display pixels may be controlled using data lines and gate lines. The gate lines may control thin-film transistors in the pixel circuits. Gate driver circuitry along the left and right edges of the display may supply signals to the gate lines. The pixel circuits may be located in the center of the display between the gate driver circuitry. Some of the anodes may overlap the pixel circuits and some of the anodes may overlap the gate driver circuitry. | 10-29-2015 |
20160063922 | Organic Light-Emitting Diode Display - A display may have an array of organic light-emitting diode display pixels. Each display pixel may have a light-emitting diode that emits light under control of a drive transistor. Each display pixel may also have control transistors for compensation and programming operations. Each display pixel may have six thin-film transistors and one capacitor. One of the six transistors may serve as the drive transistor and may be compensated using the remaining five transistors and the capacitor. The capacitor may have a first terminal coupled to the gate of the drive transistor and a second terminal coupled to the light-emitting diode. In one embodiment, two scan control signals and two emission control signals may be used for each row of display pixels. In another embodiment, a single scan control signal and a single emission control signal may be formed for each row of display pixels. | 03-03-2016 |
20160087022 | Silicon and Semiconducting Oxide Thin-Film Transistor Displays - An electronic device display may have an array of pixel circuits. Each pixel circuit may include an organic light-emitting diode and a drive transistor. Each drive transistor may be adjusted to control how much current flows through the organic light-emitting diode. Each pixel circuit may include one or more additional transistors such as switching transistors and a storage capacitor. Semiconducting oxide transistors and silicon transistors may be used in forming the transistors of the pixel circuits. The storage capacitors and the transistors may be formed using metal layers, semiconductor structures. and dielectric layers. Some of the layers may be removed along the edge of the display to facilitate bending. The dielectric layers may have a stepped profile that allows data lines in the array to be stepped down towards the surface of the substrate as the data lines extend into an inactive edge region. | 03-24-2016 |