Color Patents (Class 345/83)
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Patent number: 8711067Abstract: Pixel interleaving configurations for use in high definition electronic sign displays where each and every scan line includes full red, green, and blue color representation to provide for high resolution electronic video sign displays.Type: GrantFiled: July 12, 2012Date of Patent: April 29, 2014Assignee: Daktronics, Inc.Inventors: Brent A. Joffer, Brett David Wendler, Glenn P. Luke, Nathan Lane Nearman, Chad Neal Gloege, Matthew Ray Mueller, Shannon Lee Mutschelknaus, Joseph Gerard Schulte, Eric Steven Bravek, Ryan Mark Hansen
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Publication number: 20140111565Abstract: A display driving circuit (104) comprises a table generating unit (64) which generates a table necessary for driving according to a color representation instruction, based on pallet data which is a driving condition of a display device corresponding to the color representation and according to a time-sequential color representation instruction which is instructed in advance, a table storage unit (62) which stores these tables, and a pallet data setting unit (114) which refers to these tables, obtains pallet data corresponding to each lighting cycle at a lighting timing delayed with a delay period for each channel unit number stored in a delay period data storage unit (40), assigns the obtained pallet data while sequentially switching the pallet data according to switching of the lighting cycle, and sets a driving condition of each display device of a display channel unit.Type: ApplicationFiled: December 23, 2013Publication date: April 24, 2014Inventors: Takuya TAKEUCHI, Masanori MIYAO
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Publication number: 20140111408Abstract: Image projection utilizing light-emitting diodes on a silicon (LEDoS) substrate is described herein. LEDoS devices selectively activate LED pixels to produce light. Light can excite color conversion materials of the LEDoS devices to form color images. Images can be projected onto a projection surface.Type: ApplicationFiled: October 15, 2013Publication date: April 24, 2014Applicant: The Hong Kong University of Science and TechnologyInventors: Kei May Lau, Zhao Jun Liu, Chik Yue
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Patent number: 8704847Abstract: Display systems and image processing methods process pre-subpixel rendered images embedded in input color image data. The display systems include a pre-subpixel rendered (P-SPR) image detector that detects locations of a marking code that marks the portion of the input data that has been pre-subpixel rendered and which is ready for direct display. Several display system embodiments comprise first and second image data paths; the input data that requires subpixel rendering proceeds along the first path while the P-SPR image data proceeds along the second path. Another display system embodiment processes the combined input and P-SPR data along a single data path. Techniques for marking and detecting P-SPR image data using two distinct marking codes are presented in the context of the subpixel layout of the display. Techniques for using P-SPR data to display high-quality graphical symbols (e.g., font glyphs) are suitable for small, low-cost display devices.Type: GrantFiled: April 4, 2006Date of Patent: April 22, 2014Assignee: Samsung Display Co., Ltd.Inventors: Michael Francis Higgins, Seok Jin Han, Candice Hellen Brown Elliott
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Patent number: 8704858Abstract: A display unit includes: a display section including a plurality of pixels, each of the pixels including a plurality of light-emitting devices; an operation section that performs calculations for correcting drive signals to be inputted into the light-emitting devices of the pixels included in the display section in order to correct luminances and chromaticities of the pixels; and a coefficient data input section where a bit number of an element having smaller variations in coefficient in the display section, among elements of each of coefficient matrixes necessary for the correction calculations, the coefficient matrixes to be inputted into the operation section, is set to a value smaller than a bit number of an element having larger variations.Type: GrantFiled: June 30, 2009Date of Patent: April 22, 2014Assignee: Sony CorporationInventors: Hiroshi Tobita, Takehiro Misonou
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Patent number: 8698782Abstract: To shorten a period necessary for a plurality of photosensors arranged in a display and data input region to receive light. In a first period, a reset operation is concurrently performed and then a storage operation is concurrently performed in a plurality of first photosensors while a plurality of first light-emitting elements emit light concurrently and a plurality of second light-emitting elements do not emit light. In a second period, the reset operation is concurrently performed and then the storage operation is concurrently performed in a plurality of second photosensors while the plurality of second light-emitting elements emit light concurrently and the plurality of first light-emitting elements do not emit light. In a third period, a selection operation is sequentially performed in the plurality of first photosensors and the selection operation is sequentially performed in the plurality of second photosensors.Type: GrantFiled: December 19, 2011Date of Patent: April 15, 2014Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventor: Yoshiyuki Kurokawa
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Publication number: 20140091993Abstract: A high-resolution, Active Matrix (AM) programmed monolithic Light Emitting Diode (LED) micro-array is fabricated using flip-chip technology. The fabrication process includes fabrications of an LED micro-array and an AM panel, and combining the resulting LED micro-array and AM panel using the flip-chip technology. The LED micro-array is grown and fabricated on a sapphire substrate and the AM panel can be fabricated using PMOS process, NMOS process, or CMOS process. LED pixels in a same row share a common N-bus line that is connected to the ground of AM panel while p-electrodes of the LED pixels are electrically separated such that each p-electrode is independently connected to an output of drive circuits mounted on the AM panel. The LED micro-array is flip-chip bonded to the AM panel so that the AM panel controls the LED pixels individually and the LED pixels exhibit excellent emission uniformity.Type: ApplicationFiled: December 5, 2013Publication date: April 3, 2014Applicant: NANO AND ADVANCED MATERIALS INSTITUTE LIMITEDInventors: Kei May LAU, Zhaojun LIU
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Publication number: 20140085170Abstract: A method of operating an organic light emitting display device including a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel, wherein a first gamma voltage for the red, green and blue sub-pixels and a second gamma voltage for the white pixel are adjusted such that a sum of maximum luminances of the red, green and blue sub-pixels is substantially equal to a luminance of a white color displayed by the organic light emitting display device. With respect to a white portion of input data, a ratio of first data of the red, green and blue sub-pixels to second data of the white sub-pixel is adjusted based on a first accumulated driving amount of the red, green and blue sub-pixels and a second accumulated driving amount of the white sub-pixel.Type: ApplicationFiled: January 31, 2013Publication date: March 27, 2014Applicant: SAMSUNG DISPLAY CO., LTD.Inventors: Jong-Woong PARK, Won-Woo JANG, Joo-Hyung LEE
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Publication number: 20140078031Abstract: A method of driving an organic light emitting display includes dividing one frame into a plurality of subfields, setting a plurality of pixels to include first pixels positioned in odd horizontal lines and second pixels positioned in even horizontal lines, and setting pixels that realize low grayscales in an emission state in one of the plurality of subfields, such that the first pixels have emission states in different subfields than emission states of the second pixels, when the low grayscales are realized.Type: ApplicationFiled: February 8, 2013Publication date: March 20, 2014Inventors: Hwan-Soo JANG, Yang-Wan KIM, Jin-Tae JEONG
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Patent number: 8674914Abstract: Switching TFTs are controlled to a conducting state and a switching TFT to a non-conducting state, to provide a potential according to a threshold voltage to a gate terminal of a driving TFT. Then, in at least one embodiment, with the TFT maintaining the conducting state, a potential of a data line Sj is changed from a reference potential Vpc to a data potential Vdata to place the TFT in a conducting state. At this time, a current Ia flows and thus the gate terminal potential of the TFT rises. The higher the mobility of the TFT, the larger the amount of change in gate terminal potential and the smaller the current flowing through an organic EL element upon light emission. By this, a current that is not affected by variations in the threshold voltage of the TFT nor by variations in the mobility of the TFT flows through the organic EL element. Thus, in a current-driven type display device, variations in both the threshold voltage and mobility of a drive element are compensated for.Type: GrantFiled: June 1, 2009Date of Patent: March 18, 2014Assignee: Sharp Kabushiki KaishaInventor: Seiji Ohhashi
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Patent number: 8659511Abstract: A data driver capable of displaying images with a substantially uniform brightness, an organic light emitting display device using the same, and a method of driving the organic light emitting display device. The data driver includes a plurality of current sink units for controlling predetermined currents to flow through data lines, a plurality of voltage generators for resetting values of gray scale voltages using compensation voltages generated when the predetermined currents flow, a plurality of digital-to-analog converters for selecting one gray scale voltage among the gray scale voltages as a data signal in response to bit values of the data supplied from the outside, and a plurality of switching units for supplying the data signal to the data lines. The predetermined currents may be set equal to pixel currents that correspond to a maximum brightness.Type: GrantFiled: August 7, 2006Date of Patent: February 25, 2014Assignees: Samsung Display Co., Ltd., IUCF-HYU (Industry-University Cooperation Foundation Hanyang University)Inventors: Do Hyung Ryu, Bo Yong Chung, Hong Kwon Kim, Oh Kyong Kwon
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Patent number: 8654064Abstract: An LED backlight array in which every LED, regardless of whether it is a red, green, cyan, or blue LED, contains a blue emitter. As each LED contains the same type of emitter, the backlight can be driven by a single blue driver circuit, rather than separate red, green, cyan, and blue drivers. That is, the present disclosure removes the need for red, cyan, and green driver circuits, allowing for simpler and cheaper backlights. Additionally, even though the LED backlight can contain LEDs of different colors, each has a blue emitter, and thus possesses similar aging characteristics.Type: GrantFiled: October 18, 2010Date of Patent: February 18, 2014Assignee: Samsung Display Co., Ltd.Inventor: Candice Hellen Brown Elliott
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Patent number: 8646939Abstract: A display system includes an illumination unit in which a predetermined light spectrum can be produced with the illumination unit, the average light intensity of which light spectrum can be reduced or increased over the wavelength range of 420 nm to 500 nm relative to the average light intensity above and below this wavelength range such that the predetermined light spectrum is greater relative to a light spectrum produced without this reduction or increase.Type: GrantFiled: December 23, 2009Date of Patent: February 11, 2014Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.Inventors: Matthias Bues, Oliver Stefani, Achim Pross
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Patent number: 8633873Abstract: 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.Type: GrantFiled: November 11, 2010Date of Patent: January 21, 2014Assignee: Ignis Innovation Inc.Inventors: Gholamreza Chaji, Arokia Nathan
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Patent number: 8624809Abstract: Methods, systems, and apparatus, including computer program products, for communicating information. An event is detected. A light effect is emitted in response to the detected event. The emitted light effect simulates the detected event or a sensory output associated with the detected event.Type: GrantFiled: November 29, 2007Date of Patent: January 7, 2014Assignee: Apple Inc.Inventor: Peter Henry Mahowald
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Patent number: 8624943Abstract: Disclosed herein is a method for driving an image display apparatus including: an image display panel whereon pixels each having first to third sub-pixels are laid out in first and second directions to form a 2-dimensional matrix, at least each specific pixel and an adjacent pixel adjacent to the specific pixel in the first direction are used as first and second pixels respectively to create one of pixel groups, and a fourth sub-pixel is placed between the first and second pixels in each of the pixel groups; and a signal processing section configured to generate first to third sub-pixel output signals for the first pixel on the basis of respectively first to third sub-pixel input signals and to generate first to third sub-pixel output signals for the second pixel on the basis of respectively first to third sub-pixel input signals.Type: GrantFiled: June 17, 2009Date of Patent: January 7, 2014Assignee: Japan Display West, Inc.Inventors: Koji Noguchi, Yukiko Iijima, Akira Sakaigawa, Masaaki Kabe
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Patent number: 8624824Abstract: A backlight display has improved display characteristics. An image may be displayed on the display where the image includes a liquid crystal material with a light valve. The display receives an image signal and uses the image signal to modify the light for a backlight array and a liquid crystal layer.Type: GrantFiled: March 19, 2009Date of Patent: January 7, 2014Assignee: Sharp Laboratories of America, Inc.Inventor: Xiao-fan Feng
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Patent number: 8624807Abstract: According to a driving method of applying a reverse bias voltage, capacitance occurs due to a stacked structure of a conductor, an insulator and a conductor, or due to a structure of a TFT. This capacitance prevents normal operation. The invention provides a pixel configuration including at least a driving transistor for driving a light emitting element and a switching transistor for controlling the driving transistor, wherein the switching transistor is turned on in the case of applying a forward bias voltage after applying a reverse bias voltage. As a result, it is prevented that the potential changes due to unwanted capacitive coupling.Type: GrantFiled: November 12, 2010Date of Patent: January 7, 2014Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Hiroyuki Miyake, Ryota Fukumoto, Tomoyuki Iwabuchi
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Patent number: 8624806Abstract: A pixel circuit and an organic light-emitting diode (OLED) display using the pixel circuit is provided. The pixel circuit includes: an OLED; a third N-channel metal-oxide semiconductor (NMOS) transistor coupled to a data line and a first scan line and configured to apply a data signal to a first node; a storage capacitor having one terminal coupled to the first node and the other terminal coupled to a second node; a fourth NMOS transistor coupled between a first power and the second node and configured to apply a voltage of the first power to the second node; a first NMOS transistor having a first electrode, a second electrode, and a gate electrode coupled to the second node; and a second NMOS transistor coupled between the second node and the first electrode of the first NMOS transistor and configured to diode-connect the first NMOS transistor.Type: GrantFiled: March 2, 2010Date of Patent: January 7, 2014Assignee: Samsung Display Co, Ltd.Inventors: Bo-Yong Chung, Keum-Nam Kim
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Patent number: 8619008Abstract: A display device includes a substrate, a plurality of pixels formed over the substrate, each pixel including two or more sub-pixels, the plurality of pixels defining a display area, and a plurality of chiplets located over the substrate in the display area, each chiplet controlling sub-pixels of at least two adjacent pixels.Type: GrantFiled: February 13, 2009Date of Patent: December 31, 2013Assignee: Global OLED Technology LLCInventor: Ronald S. Cok
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Patent number: 8614652Abstract: 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.Type: GrantFiled: April 17, 2009Date of Patent: December 24, 2013Assignee: Ignis Innovation Inc.Inventors: Arokia Nathan, G. Reza Chaji, Stefan Alexander
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Patent number: 8605127Abstract: A method for driving an active matrix organic light emitting diode (AMOLED) display panel is provided. In the present method, how to drive a single pixel having a red sub-pixel, a green sub-pixel, a first blue (light blue) sub-pixel, and a second blue (dark blue) sub-pixel is effectively determined based on the characteristics of the (1931) CIE color space. Besides, at the same time point, only one of the two sub-pixels corresponding to the two blues (i.e. dark blue and light blue) in the single pixel is enabled to be mixed with the red sub-pixel and the green sub-pixel. Accordingly, the luminous efficiency of the AMOLED is improved and the power consumption of the entire AMOLED display is reduced.Type: GrantFiled: February 7, 2011Date of Patent: December 10, 2013Assignee: Au Optronics CorporationInventors: Hsueh-Yen Yang, Tze-Chien Tsai
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Patent number: 8599186Abstract: In a pixel driving device that drives a plurality of pixels, each pixel includes a light emitting element and a pixel driving circuit comprising a driving device having one end of a current path connected to one end of the light emitting element and having another end of the current path to which a power-source voltage is applied. Provided in a controller is a correction-data obtaining function circuit which obtains a first characteristic parameter relating to a threshold voltage of the driving device of each pixel based on a voltage value of each data line after a first detection voltage is applied to each data line connected to each pixel, and a current is caused to flow through the current path of the driving device through the each data line with a voltage of another end of the light emitting element being set to be a first setting voltage.Type: GrantFiled: December 28, 2010Date of Patent: December 3, 2013Assignee: Casio Computer Co., Ltd.Inventor: Jun Ogura
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Patent number: 8593381Abstract: Degradations in light emitting elements occur with the passage of time. The invention provides a method of driving a light-emitting device provided with a plurality of pixels, which includes a light-emitting means with a first and a second electrodes, a drive means for supplying the light-emitting means with a current in response to an analog video signal, and a setting means for setting a sustaining period and an off time period within a frame period. The method of driving a light-emitting device is characterized by including the steps of: supplying the light-emitting means with the current in response to the analog video signal during the sustaining period; and turning the drive means off thereby to make the light-emitting means nonluminous or making the first and the second electrodes identical in potential thereby to make the light-emitting means nonluminous during the off time period.Type: GrantFiled: September 11, 2012Date of Patent: November 26, 2013Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Mitsuaki Osame, Aya Anzai, Yu Yamazaki, Tomoyuki Iwabuchi
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Patent number: 8593385Abstract: Disclosed are a display device and a driving method thereof. The display device includes: a display panel including a plurality of pixels, a plurality of gate lines, and a plurality of data lines; a first gate driver and a second gate driver which each transmit a gate signal to the gate lines and are at edge regions of the display panel; and a data driver which transmit data voltages to the data lines. The pixels include a plurality of first color pixels which display a first color and are connected to the first gate driver, a plurality of second color pixels which display a second color and are connected to the second gate driver, and a plurality of third color pixels which display a third color and comprise at least a pixel connected to the first gate driver and at least a pixel connected to the second gate driver.Type: GrantFiled: January 25, 2012Date of Patent: November 26, 2013Assignee: Samsung Display Co., Ltd.Inventors: Jae Hoon Lee, Whee-Won Lee, Duc-Han Cho
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Patent number: 8593445Abstract: A display apparatus employs a pixel array section including pixel circuits forming a matrix, signal lines as columns, scan lines as rows and power-supply lines, and driving sections. The driving sections are a signal selector, a write scanner and a drive scanner. The signal selector provides an electric potential representing a gradation or a predetermined reference electric potential. The write scanner provides a control signal. The drive scanner provides a power-supply voltage changing the electric potential from high to low. The drive scanner drives adjacent power-supply lines as a group. The number of lines as a group is determined in advance. The drive scanner switches a power-supply voltage from high to low and vice versa, and applies the voltage to groups by shifting the phase from group to group. The voltage is supplied to a group at the same phase and switched the electric potential.Type: GrantFiled: April 30, 2009Date of Patent: November 26, 2013Assignee: Sony CorporationInventors: Tetsuro Yamamoto, Katsuhide Uchino, Naobumi Toyomura
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Publication number: 20130307760Abstract: An organic light emitting display includes a plurality of scan lines, a plurality of data lines crossing the scan lines, a plurality of sub pixels coupled to the scan lines and the data lines, and an auxiliary scan line coupling at least two of the scan lines coupled to respective ones of the sub pixels of a pixel.Type: ApplicationFiled: September 10, 2012Publication date: November 21, 2013Inventor: Hyung-Soo Kim
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Patent number: 8587346Abstract: A driving circuit is disclosed that has low power consumption and supplies a current to a load. The driving circuit includes a constant current circuit section to generate and output a predetermined constant current, a current mirror circuit section to generate a current proportional to an input current supplied from the constant current circuit section and supply the current to the load, and a constant voltage supplying circuit section to generate a constant voltage and supply the constant voltage to a series circuit of the load and an output transistor of the current mirror circuit. The constant voltage supplying circuit section gene-rates the constant voltage so that an output voltage of the current mirror circuit section equals an input voltage of the current mirror circuit section.Type: GrantFiled: September 18, 2006Date of Patent: November 19, 2013Assignee: Ricoh Company, Ltd.Inventor: Tomohiko Kamatani
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Publication number: 20130300639Abstract: An organic light emitting display device including: red sub-pixels, each including a red organic light emitting diode and a driving transistor; green sub-pixels, each including a green organic light emitting diode and a driving transistor; and blue sub-pixels, each including a blue organic light emitting diode and a driving transistor, wherein the driving transistors of the red, green, and blue sub-pixels are configured to be initialized by a voltage applied to an anode electrode of the red, green, or blue organic light emitting diodes.Type: ApplicationFiled: August 16, 2012Publication date: November 14, 2013Inventor: Dong-Hwi Kim
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Patent number: 8570255Abstract: A pixel includes a light emitting element and a driving element connected to the light emitting element. After an initial voltage is applied to one end of a current path of the driving element via the signal line, the pixel driving device acquires the threshold voltage of the driving element based on a voltage value at a terminal of the signal line when the initial voltage is cut off and the relaxation time is elapsed. The voltage-current characteristics of the driving element is acquired based on the voltage value at the terminal of the signal line when the current flows into the current path of the driving element via the signal line. The current gain value of the driving element is acquired based on the threshold voltage of the driving element. The image data is corrected based on the acquired threshold voltage.Type: GrantFiled: March 30, 2010Date of Patent: October 29, 2013Assignee: Casio Computer Co., Ltd.Inventors: Manabu Takei, Jun Ogura, Shunji Kashiyama, Tsuyoshi Ozaki
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Patent number: 8570270Abstract: An edge-lit backlight unit for displays is provided. In one embodiment, the backlight may include a light guide configured to receive light from a light source along a first lateral edge. The received light propagates towards a second opposite lateral edge. The backlight unit may include an arrangement of light-extracting elements configured to extract a portion of the propagating light and to allow the remaining portion to reach the second edge. In one embodiment, a specular reflector disposed at the second edge causes the light reaching the second edge to retro-propagate back towards the first edge. In certain embodiments, the retro-propagating light may be between approximately 5 to 35 percent of the total light received by the light guide. The retro-propagating light may be extracted by multiple light-extracting elements and mixed with the extracted propagating light to provide improved color uniformity along an axis of the display.Type: GrantFiled: February 22, 2010Date of Patent: October 29, 2013Assignee: Apple Inc.Inventors: Chenhua You, Shengmin Wang
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Patent number: 8558782Abstract: Systems, methods, and devices are provided for maintaining a target white point on a light emitting diode (LED) based backlight. In one embodiment, the backlight may include two or more groups of LEDs, each driven at a respective driving strength. Each group may include LEDs of a different chromaticity, and the respective driving strengths may be adjusted, for example, by varying the duty cycles, to maintain the target white point. To ensure that the white point may be maintained over an operational temperature range of the backlight, the LEDs may be selected so that the chromaticities of each group of LEDs are separated by at least a minimum chromaticity difference. Further, the LEDs may be selected so that at the equilibrium temperature of the backlight, the LEDs may produce the target white point when driven at substantially equal driving strengths.Type: GrantFiled: July 13, 2010Date of Patent: October 15, 2013Assignee: Apple Inc.Inventors: Chenhua You, Jean-Jacques Philippe Drolet, Wei Chen
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Patent number: 8558769Abstract: An active-matrix display device employs current-programmed-type pixel circuits and performs the writing data to each of pixels on a line-by-line basis. The active-matrix display device having a matrix of current-programmed-type pixel circuits includes a data line driving circuit 15 formed of m current driving circuits (CD) 15-1 to 15-m arranged corresponding to respective data lines 13-1 to 13-m. The data line driving circuit (CD) 15-1 to 15-m holds image data (luminance data herein) in the form of voltage, and then converts the voltage of the image data into a current signal. The current signal is then fed to the data lines 13-1 to 13-m at a time. The image information is thus written on the pixel circuits 11.Type: GrantFiled: February 10, 2012Date of Patent: October 15, 2013Assignee: Sony CorporationInventor: Akira Yumoto
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Patent number: 8552963Abstract: A control circuit may include a first feedback input terminal which receives the cathode terminal voltage of light-emitting elements from a current driving circuit as a feedback signal. Such an arrangement controls the ON/OFF state of a switching element such that the cathode terminal voltage approaches a predetermined voltage. A second feedback input terminal may be included to receive the anode terminal voltage of the light-emitting elements as a feedback signal. Such an arrangement controls the ON/OFF state of the switching element such that the anode terminal voltage does not exceed a predetermined threshold voltage. A feedback output terminal may be included of the current driving circuit which allows the cathode terminal voltage of the light-emitting elements to be input to a control circuit for the switching regulator as a feedback signal. The control circuit and the current driving circuit may be integrally provided in the form of separate semiconductor chips.Type: GrantFiled: October 26, 2005Date of Patent: October 8, 2013Assignee: Rohm Co., Ltd.Inventors: Tomoyuki Ito, Isao Yamamoto
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Patent number: 8554279Abstract: A boosting circuit unit supplies a boosting voltage to one terminal of a backlight. A boosting comparator compares a voltage applied to the other terminal of the backlight with a predetermined reference voltage value, and outputs a comparison result as a feedback signal reflecting the boosting voltage to the boosting circuit unit. An LED driver unit is connected to the other terminal of the backlight and supplies drive current to the backlight. An acquisition unit acquires a PWM signal, which is generated based on the content of a video signal and can be used to change the luminance of the backlight. An LPF unit outputs a time-averaged signal of the acquired PWM signal as a control signal to be supplied to the LED driver unit.Type: GrantFiled: November 12, 2008Date of Patent: October 8, 2013Assignees: Semiconductor Components Industries, LLC., Sanyo Semiconductor Co., Ltd.Inventor: Nobuyuki Otaka
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Publication number: 20130257923Abstract: The present invention relates to a display device using LED blocks, which includes at least one LED block having an LED installed. The LED block adjusts the color of light displayed according to the contact by the user. According to the present invention, the display device using LED blocks includes: at least one LED block including a plurality of installed color LEDs and a contact sensing unit for sensing contact by the user; and a controller for adjusting the color of light displayed by the LED block on the basis of the color data corresponding to the contact data which is generated by the contact sensing unit in accordance with contact by the user.Type: ApplicationFiled: June 17, 2011Publication date: October 3, 2013Applicant: CONSTANTEC CO., LTD.Inventor: Woonyong Choi
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Patent number: 8547371Abstract: Prior to increasing the voltage level of an input signal to be sampled in a step-by-step manner and writing a signal voltage Vsig at a desired voltage level, a precharge is performed which writes a precharge voltage Vpre, lower than the signal voltage Vsig, so as to apply the same voltage Vpre to the gate of a drive transistor in advance. This not only provides a reduced gate-to-source voltage of the drive transistor at the time of writing of the signal voltage Vsig but also extends a mobility correction time required for a mobility correction operation. The extension of the mobility correction time required for the mobility correction operation ensures a relatively smaller variation in the correction time, thus suppressing the variation in brightness. The extension also permits a write pulse to be set to the optimal pulse width.Type: GrantFiled: January 7, 2008Date of Patent: October 1, 2013Assignee: Sony CorporationInventors: Takao Tanikame, Yukihito Iida, Tetsuo Minami, Katsuhide Ucnino
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Patent number: 8547300Abstract: The present invention relates to a light emitting display, and display panel and driving method thereof. The display panel includes a plurality of data lines for transmitting a data signal, a plurality of scan lines for transmitting a selection signal, and a plurality of pixels coupled to the data lines and the scan lines. The pixel includes at least two emitters for emitting different colors from each other in response to an applied current, and a driver for receiving the data signal while the selection signal is applied and outputting a first current corresponding to the data signal. The driver outputs the first current to at least the first and second emitters for emitting substantially the same color among the emitters formed in the pixels.Type: GrantFiled: June 20, 2005Date of Patent: October 1, 2013Assignee: Samsung Display Co., Ltd.Inventors: Won-Kyu Kwak, Jin-Tae Jeong, Choon-Yul Oh
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Patent number: 8531349Abstract: A dual display module having a first display panel and a second display panel, the dual display module including a bezel arranged between the first display panel and the second display panel, and having a penetration area between the first display panel and the second display panel; and a supporting member arranged between the bezel and the second display panel and supporting the second display panel, the supporting member having at least one protrusion unit that protrudes through the penetration area to face the first display panel.Type: GrantFiled: March 18, 2009Date of Patent: September 10, 2013Assignee: Samsung Display Co., Ltd.Inventors: Yoon-Chan Oh, Chan-Kyoung Moon, Kyoung-Soo Lee, Min-Hyeng Lee, Seon-Hee Kim, Gun-Mo Kim, Choong-Ho Lee, Byung-Hee Kim, Kuen-Dong Ha
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Patent number: 8519921Abstract: An organic light emitting diode (OLED) display includes an illuminance sensing unit configured to sense an external illuminance, a brightness determination unit configured to determine a brightness of the OLED display according to an illuminance sensed by the illuminance sensing unit, a driving voltage determination unit configured to determine a driving voltage corresponding with a current saturation point of the OLED display, the driving voltage being determined based at least in part on a driving current and the brightness determined by the brightness determination unit, a voltage conversion unit configured to receive an input voltage, generate a first voltage higher than the input voltage, and generate a second voltage lower than the input voltage, and a display unit configured to receive the first and second voltages from the voltage conversion unit and display an image.Type: GrantFiled: January 14, 2008Date of Patent: August 27, 2013Assignee: Samsung Display Co., Ltd.Inventors: Duk-Jin Lee, Jeong-No Lee
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Patent number: 8519920Abstract: An organic light emitting device includes a substrate having a plurality of pixels, each pixel comprising a plurality of sub-pixels. Each sub-pixel includes an emission area that has a first electrode, a second electrode and an emitting layer, with the emitting layer of at least one sub-pixel includes a phosphorescence material. In addition to these features, the device includes a scan line to provide scan signal to a corresponding sub-pixel, a data line configured to supply data signal to a corresponding sub-pixel, and a power supply line to provide power to a corresponding sub-pixel. The data line and power supply line have a single-layer structure, and a taper angle of each of the data line and the power supply line lies in a predetermined range.Type: GrantFiled: December 4, 2007Date of Patent: August 27, 2013Assignee: LG Display Co., Ltd.Inventor: Yunsik Jeong
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Patent number: 8508518Abstract: A pixel array section includes a plurality of pixel circuits disposed in a matrix and each including a driving transistor, a storage capacitor, an electro-optical element, and a sampling transistor. Each pixel circuit includes a pixel divided into a plurality of divisional pixels for each of which an electro-optical element is provided, and a test transistor provided between the driving transistor and the electro-optical elements for carrying out on/off operations for specifying whether or not the electro-optical element is a dark spot element so that the electro-optical element of the dark spot can be specified. The number of the test transistors is smaller than the number of the divisional elements of the original one pixel.Type: GrantFiled: October 30, 2008Date of Patent: August 13, 2013Assignee: Sony CorporationInventors: Katsuhide Uchino, Tetsuro Yamamoto
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Patent number: 8502758Abstract: Methods and displays are disclosed for presenting media content on display systems. A display is configured as an array of LEDs. The array of LEDs includes a first set of rows including first LEDs in a repeating pattern of a first color LED, a second color LED, and a third color LED. A second set of rows includes second LEDs in a repeating pattern of the first color LED, the second color LED, and the third color LED, wherein the second set of rows are interleaved between the first set of rows and the second LEDs are offset relative to the first LEDs. Visual content to be presented on the display includes a repeating sequence of four frames of an array of virtual pixels such that each virtual pixel of the array comprises at least one of the first LEDs and at least one of the second LEDs.Type: GrantFiled: December 10, 2009Date of Patent: August 6, 2013Assignee: Young Electric Sign CompanyInventors: Graham N. Beland, James Blake Gover, Clifford B. Brown, Brent W. Brown
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Patent number: 8497885Abstract: A display apparatus includes a matrix of light emitting elements, a plurality of drive circuits provided for driving the light emitting elements, a plurality of scanning lines to which a scanning signal is applied to select the drive circuits on a row basis, a plurality of control lines to which a light-emission control signal is applied to determine an emission period of the light emitting elements, and a plurality of data lines to which image signals are applied to define brightness of the light emitting elements on a column basis. The scanning signal is sequentially applied to the scanning lines in a field so that the image signals of the data lines are programmed in the drive circuits, and the light-emission control signal is sequentially applied to the control lines to make the light emitting elements emit light with brightness corresponding to the image signal programmed to the drive circuit.Type: GrantFiled: August 20, 2008Date of Patent: July 30, 2013Assignee: Canon Kabushiki KarshaInventors: Kouji Ikeda, Kohichi Nakamura, Masami Iseki
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Patent number: 8497821Abstract: A display device, including a substrate; an array of pixels arranged in rows and columns forming a light-emitting area over the substrate, each pixel including a first electrode, one or more layers of light-emitting material located over the first electrode, and a second electrode located over the one or more layers of light-emitting material; a first serial buss having a plurality of electrical conductors, each electrical conductor connecting one chiplet in a first set of chiplets to only one other chiplet in the first set in a serial connection, the chiplets being distributed over the substrate in the light-emitting area, each chiplet including one or more store-and-forward circuits for storing and transferring data connected to its corresponding electrical conductor; and a driver circuit in each chiplet for driving at least one pixel in response to data stored in the store-and-forward circuit.Type: GrantFiled: February 16, 2009Date of Patent: July 30, 2013Assignee: Global OLED Technology LLCInventor: Ronald S. Cok
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Patent number: 8493292Abstract: An organic light emitting diode (“OLED”) display includes a substrate; a gate line formed on the substrate; a secondary gate line substantially parallel to the gate line; a plurality of control electrodes each connected to one of the gate line and the secondary gate line; a data line intersecting the gate line and the secondary gate line; a switching thin film transistor (“TFT”) connected to the gate line and the data line; a driving TFT connected to the switching TFT; a first electrode connected to the driving TFT; a second electrode facing the first electrode; and a light emitting member formed between the first electrode and the second electrode.Type: GrantFiled: January 10, 2007Date of Patent: July 23, 2013Assignee: Samsung Display Co., Ltd.Inventor: Joon-Hoo Choi
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Publication number: 20130169697Abstract: A device and a method for displaying an image, a device and a method for supplying power, and a method for adjusting brightness of contents are provided. The device for displaying the image includes: a pixel value converter which, if a plurality of color pixel values of the image is received, converts the received color pixel values; a display panel which includes a plurality of color light-emitting devices and which drives each of the plurality of color light-emitting devices based on the converted color pixel values; a light-emission controller which provides the display panel with a control signal which variably controls respective driving times of each of the color light-emitting devices based on colors; and a global controller which controls the light-emission controller to variably adjust a duty ratio of the control signal based on colors and the converted color pixel values.Type: ApplicationFiled: December 19, 2012Publication date: July 4, 2013Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventor: SAMSUNG ELECTRONICS CO., LTD.
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Patent number: 8471791Abstract: A display device includes a display panel; and a backlight panel provided below the display panel and defining a plurality of regions. A first array of light emitting diodes (LEDs) is provided along a first direction, each LED of the first array being coupled to a first line. A driver is coupled to the first line to drive the LEDs coupled to the first line. A second array of LEDs is provided along a second direction, each LEDs of the second array being coupled to a second line. A lighting condition of the regions defined by the backlight panel is controlled by turning on or off the LEDs.Type: GrantFiled: August 14, 2007Date of Patent: June 25, 2013Assignee: IXYS CorporationInventors: Nathan Zommer, Sam Seiichiro Ochi
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Publication number: 20130154910Abstract: A display panel has a pixel array arranged with a plurality of columns and a plurality of rows. The display panel includes a first pixel group and a second pixel group arranged in the first row and adjacent to each other. The first pixel group and the second pixel group respectively include a first color sub-pixel, a second color sub-pixel, a third color sub-pixel, and a transparent sub-pixel. The arrangement of the first color sub-pixel, the second color sub-pixel, the third color sub-pixel, and the transparent sub-pixel of the first pixel group and the arrangement of the first color sub-pixel, the second color sub-pixel, the third color sub-pixel, and the transparent sub-pixel of the second pixel group are symmetric in mirror.Type: ApplicationFiled: May 21, 2012Publication date: June 20, 2013Applicant: AU OPTRONICS CORPORATIONInventors: Shang-Chieh Chu, Hsueh-Yen Yang, Hong-Shen Lin
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Patent number: 8466854Abstract: An organic electro-luminescent device package includes an organic electro-luminescent device array substrate, a transparent cover, and a frit. The organic electro-luminescent device array substrate includes a first substrate and a plurality of organic electro-luminescent devices arranged on the first substrate in an array. The transparent cover is disposed over the organic electro-luminescent device array substrate. The transparent cover includes a second substrate and a conductive layer disposed on the second substrate. The organic electro-luminescent devices are located between the first substrate and the second substrate. The frit is disposed between the organic electro-luminescent device array substrate and the transparent cover to surround the organic electro-luminescent devices. The frit is located between the first substrate and a portion of the conductive layer, and the portion of the conductive layer corresponding to the frit is transparent.Type: GrantFiled: July 19, 2010Date of Patent: June 18, 2013Assignee: Au Optronics CorporationInventors: Chih-Che Liu, Shih-Feng Hsu