Diverse-type Energizing Or Bias Supplies To Different Electrodes Patents (Class 315/169.1)
  • Patent number: 8723762
    Abstract: In an example embodiment, a display apparatus includes a substrate having wiring lines formed by a conductor film including signal and scanning lines arranged in columns and rows, and a matrix of pixels, and includes a light-emitting material interposed between an anode and cathode electrode and a first and second uneven zone are between the anode electrode of the pixel and an adjacent pixel. The first uneven zone is formed on the substrate due to level differences resulting from the presence of the scanning lines. The second uneven zone is formed on the substrate also due to level differences resulting from the presence of the scanning lines. A pattern of the conductor film of which the wiring lines are made is formed so part of recessed portions of the first uneven zone are located behind their corresponding raised portions of the second uneven zone, as viewed from inside the pixel.
    Type: Grant
    Filed: August 28, 2012
    Date of Patent: May 13, 2014
    Assignee: Sony Corporation
    Inventors: Katsuhide Uchino, Tetsuro Yamamoto
  • Patent number: 8723764
    Abstract: A pixel to compensate for the deterioration of an organic light emitting diode, the pixel including an organic light emitting diode; a pixel circuit including a driving transistor controlling an amount of current supplied to the organic light emitting diode; and a compensator compensating for the deterioration of the organic light emitting diode by using on-voltage applied when current flows in the organic light emitting diode and off-voltage applied when current does not flow in the organic light emitting diode; wherein the compensator includes: a compensating capacitor having a second terminal connected to a gate electrode of the driving transistor; and a first compensating transistor connected between a first terminal of the compensating capacitor and an anode electrode of the organic light emitting diode.
    Type: Grant
    Filed: January 12, 2011
    Date of Patent: May 13, 2014
    Assignee: Samsung Display Co., Ltd.
    Inventor: Yang-Wan Kim
  • Patent number: 8717269
    Abstract: The invention provides an active matrix EL display device which can perform a clear multi-gray scale color display. In particular, the invention provides a large active matrix EL display device at low cost by a manufacturing method which can selectively form a pattern. Power supply lines in a pixel portion are arranged in matrix by the manufacturing method which can selectively form a pattern. Further, capacitance between wirings is reduced by providing a longer distance between adjacent wirings by the manufacturing method which can selectively form a pattern.
    Type: Grant
    Filed: August 20, 2013
    Date of Patent: May 6, 2014
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Yasunori Yoshida, Hajime Kimura, Shinji Maekawa, Osamu Nakamura, Shunpei Yamazaki
  • Publication number: 20140117860
    Abstract: Provided is a display apparatus including a plurality of unit pixels, each including a plurality of sub-pixels; a first line branched in a first direction from a common line as many as the number of sub-pixels in each of the unit pixels so as to connect sub-pixels emitting light of the same color in neighboring unit pixels to each other; a second line extending in a second direction that crosses the first direction and connected to the sub-pixels; and a third line adjacent to the second line, extending in the second direction, and including a hole formed on a portion where the first line and the third line cross each other, and connected to the sub-pixels.
    Type: Application
    Filed: March 13, 2013
    Publication date: May 1, 2014
    Inventors: Na-Young KIM, Ki-Nyeng KANG, Keum-Nam KIM
  • Patent number: 8704735
    Abstract: A display method of a plasma display apparatus to which primary color video signals are inputted and which carries out color display by letting phosphors for primary colors emit light is provided. The display method displays the primary color video signals by changing a gray level of an output primary color video signal in accordance with a gray level of an input primary color video signal. When each gray level of the inputted primary color video signals changes from a first value to a second value which is larger than the first value, a gray level of a primary color video signal for a phosphor having the largest influence of luminance saturation properties among the phosphors is increased relative to a gray level of the other primary color video signal.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: April 22, 2014
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Ken Kumakura, Hideaki Ohki, Yuichiro Kimura, Yasuji Noguchi, Takayuki Ooe
  • Patent number: 8692742
    Abstract: 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.
    Type: Grant
    Filed: September 1, 2009
    Date of Patent: April 8, 2014
    Assignee: AU Optronics Corporation
    Inventors: Tsung-Ting Tsai, Lee-Hsun Chang
  • Patent number: 8692744
    Abstract: A display device is disclosed. The display device includes: a pixel array unit and a driving unit which drives the pixel array unit. The pixel array unit includes rows of first scanning lines and second scanning lines, columns of signals, pixels in a matrix state arranged at portions where the scanning lines and the signal lines cross each other and power supply lines and ground lines supplying power to respective pixels. The driving unit includes a first scanner performing line-sequential scanning to pixels by each row by supplying a first control signal to each first scanning line sequentially, a second scanner supplying a second control signal to each second scanning line sequentially so as to correspond to the line-sequential scanning and a signal selector supplying a video signal to rows of signal lines so as to correspond to the line-sequential scanning.
    Type: Grant
    Filed: April 26, 2012
    Date of Patent: April 8, 2014
    Assignee: Sony Corporation
    Inventors: Junichi Yamashita, Takao Tanikame, Katsuhide Uchino
  • Patent number: 8674977
    Abstract: A driving method of a display device having a driving transistor and a display element, one source/drain region of the driving transistor connected to a power supply part, the other source/drain region connected to an anode electrode provided in the display element, the method includes the steps of: setting a potential of the anode electrode by applying a predetermined intermediate voltage to the anode electrode so that a potential difference between the anode electrode of the display element and a cathode electrode at the other end of the display element does not exceed a threshold voltage of the display element; and then holding the driving transistor in OFF-state while a drive voltage is applied from the power supply part to one source/drain region of the driving transistor.
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: March 18, 2014
    Assignee: Sony Corporation
    Inventors: Junichi Yamashita, Katsuhide Uchino
  • Patent number: 8674906
    Abstract: An organic light emitting display device operates for an initializing period, a scan period and an emission period divided from one frame period. The organic light emitting display device includes: a data driver for supplying data signals to output lines; a connecting unit for selectively coupling a data line of data lines to a corresponding one of the output lines or an initial power supply, and being positioned between the output lines and the data lines; a second power driver for applying second power having a low level and a high level to pixels positioned at crossing regions of scan lines and the data lines; and a first control line commonly coupled to the pixels, in which each of the pixels includes an organic light emitting diode, and an anode electrode of the organic light emitting diode is supplied with a voltage of the initial power supply for the initializing period.
    Type: Grant
    Filed: January 10, 2011
    Date of Patent: March 18, 2014
    Assignee: Samsung Display Co., Ltd.
    Inventors: Young-In Hwang, Yong-Sung Park, Chul-Kyu Kang, Seong-Il Park
  • Patent number: 8670005
    Abstract: The present invention discloses a method for and a system for reducing the dynamic false contour in the image of an alternating current plasma display. The method includes the following steps: dividing each frame image into multiple subfields; accounting the number and the probability of the dynamic false contour appeared in each frame image; based on the result of the accounting, carrying out an optimized coding for the pixel data of each frame image, and if there is an error generated by the optimized coding, diffusing the error generated by the optimized coding into neighboring pixels.
    Type: Grant
    Filed: November 21, 2008
    Date of Patent: March 11, 2014
    Assignee: Sichuan COC Display Devices Co., Ltd.
    Inventor: Weilin Lei
  • Patent number: 8665181
    Abstract: This disclosure relates to a method for driving an AC type plasma display panel. According to this disclosure, an elapse time period between an end time point of ramp-down and a time when a first scan pulse is applied is maintained to be uniform even when a ramp-down slope is different in such a manner that a comparator of a scan electrode driving circuit compares an output voltage with a reference voltage and a logic control circuit outputs a control signal to a logic control circuit when the output voltage is equal to the reference voltage. Accordingly, the method for driving the AC type plasma display panel is capable of improving an address characteristic and a driving margin.
    Type: Grant
    Filed: September 30, 2009
    Date of Patent: March 4, 2014
    Assignee: Orion Co., Ltd.
    Inventors: Hwan Woo Lee, Gap Sik Park
  • Patent number: 8665247
    Abstract: A flat panel display includes a flexible substrate; a passive matrix display having an array of pixels formed on a side of the flexible substrate, and row and column electrodes formed on the same side of the flexible substrate and connected to the pixels for providing data and selection signals to the pixel elements; a plurality of electrical contacts formed on the same side of the substrate and electrically connected to the row and column electrodes; and discrete data and selection drivers located on the same side of the flexible substrate around the periphery of the passive matrix display and electrically connected to the electrical contacts for driving the pixels of the passive matrix display.
    Type: Grant
    Filed: May 30, 2003
    Date of Patent: March 4, 2014
    Assignee: Global OLED Technology LLC
    Inventor: Ronald S. Cok
  • Patent number: 8659516
    Abstract: A signal line driving circuit which includes a digital signal sampling circuit, a storage circuit, a time setting circuit and a constant current circuit, is fabricated of TFTs on an insulating substrate which is made of the same substance as that of a pixel portion substrate. Thus, in a passive type EL display device, the problem of a distortion in the case of bonding the signal line driving circuit onto the pixel portion substrate can be eliminated. Besides, in an active type EL display device, each pixel is constructed of one transistor and an EL element. Thus, the aperture factor of the EL display device is enlarged.
    Type: Grant
    Filed: October 12, 2012
    Date of Patent: February 25, 2014
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Jun Koyama
  • Patent number: 8654111
    Abstract: It is aimed to increase efficiency and simplification of a pixel circuit having a threshold voltage correcting function. A sampling transistor Tr1 is brought into conduction in response to a control signal supplied from a scan line WS and samples a video signal supplied from a signal line SL to a pixel capacitor Cs during a horizontal scanning period. The pixel capacitor Cs applies an input voltage Vgs to a gate G of a drive transistor Trd in response to the sampled video signal. The drive transistor Trd supplies an output current in accordance with the input voltage Vgs to a light-emitting device EL. The output current has dependency on a threshold voltage Vth of the drive transistor Trd. In order to cancel the dependency of the output current on the threshold voltage Vth, there is provided correcting means (Tr3 and Tr4) for operating in part of the horizontal scanning period, detecting the threshold voltage Vth of the drive transistor Trd, and writing the threshold voltage Vth in the pixel capacitor Cs.
    Type: Grant
    Filed: November 14, 2006
    Date of Patent: February 18, 2014
    Assignee: Sony Corporation
    Inventors: Katsuhide Uchino, Junichi Yamashita
  • Patent number: 8648777
    Abstract: Disclosed herein is a display apparatus including a pixel array and a driver, the pixel array including rows of scanning lines, rows of feeding lines, columns of signal lines, and a matrix of pixels disposed at the crossings of the scanning lines and the signal lines, the driver including a write scanner for supplying a control signal successively to the scanning lines, a power supply scanner for switching each of the feeding lines between a high potential, a low potential, and an intermediate potential between the high potential and the low potential, and a signal selector for supplying a video signal, which alternately switches between a signal potential and a reference potential, to each of the signal lines.
    Type: Grant
    Filed: August 7, 2012
    Date of Patent: February 11, 2014
    Assignee: Sony Corporation
    Inventors: Junichi Yamashita, Katsuhide Uchino
  • Patent number: 8643631
    Abstract: There is provided a method of driving an organic light emitting display so that the organic light emitting display may be driven at a low driving frequency. The organic light emitting display includes pixels coupled to odd and even scan lines. The organic light emitting display is driven during frames. Each of the frames includes first, second, third, and fourth frame periods. The method includes: sequentially supplying scan signals to the odd scan lines in the first and third frame periods; and sequentially supplying scan signals to the even scan lines in the second and fourth frame periods. The pixels are in a non-emission state in the first and third frame periods.
    Type: Grant
    Filed: January 28, 2011
    Date of Patent: February 4, 2014
    Assignee: Samsung Display Co., Ltd.
    Inventors: Sang-Moo Choi, Keum-Nam Kim, Kyung-Hoon Chung
  • Patent number: 8643591
    Abstract: In the respect of an electrical characteristic of a transistor, a channel size W/L of a transistor is preferably designed small in order to decrease an effect of a variation in threshold voltage, while the channel size W/L is preferably designed large in order to widen a saturation region as an operation region of the transistor in the respect of characteristic of a light emitting element. Thus, decreasing an effect of a variation in threshold voltage and widening a saturation region in order not to reduce luminance due to a degradation of the light emitting element are in the relation of trade-off. According to the invention, a current capacity of a driving transistor is increased so as to operate in a wide saturation region. A lighting period control circuit is provided in each pixel for changing a lighting period of each pixel separately.
    Type: Grant
    Filed: April 15, 2011
    Date of Patent: February 4, 2014
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Hajime Kimura, Keisuke Miyagawa
  • Patent number: 8633877
    Abstract: An organic light emitting display and a driving method thereof. The organic light emitting display includes a display unit for emitting light in response to a current flowing through the display unit from a first power supply to a second power supply. The current corresponds to a data signal and a scan signal. According to one embodiment, the organic light emitting display further includes a power supply unit having a first output terminal for outputting a first power of the first power supply and a second output terminal for outputting a second power of the second power supply to the display unit, and a driving voltage calculation unit for determining a voltage of the second power corresponding to the current, thereby the power consumption of the organic light emitting display may be reduced.
    Type: Grant
    Filed: July 15, 2008
    Date of Patent: January 21, 2014
    Assignee: Samsung Display Co., Ltd.
    Inventors: Duk-Jin Lee, Jeong-No Lee, Noh-Min Kwak, Woo-Suk Jung, Gi-Na Yoo, Min-Jae Kim
  • Patent number: 8624806
    Abstract: 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: Grant
    Filed: March 2, 2010
    Date of Patent: January 7, 2014
    Assignee: Samsung Display Co, Ltd.
    Inventors: Bo-Yong Chung, Keum-Nam Kim
  • Patent number: 8624258
    Abstract: Semiconductor elements deteriorate or are destroyed due to electrostatic discharge damage. The present invention provides a semiconductor device in which a protecting means is formed in each pixel. The protecting means is provided with one or a plurality of elements selected from the group consisting of resistor elements, capacitor elements, and rectifying elements. Sudden changes in the electric potential of a source electrode or a drain electrode of a transistor due to electric charge that builds up in a pixel electrode is relieved by disposing the protecting means between the pixel electrode of the light-emitting element and the source electrode or the drain electrode of the transistor. Deterioration or destruction of the semiconductor element due to electrostatic discharge damage is thus prevented.
    Type: Grant
    Filed: September 1, 2011
    Date of Patent: January 7, 2014
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shunpei Yamazaki, Masahiko Hayakawa, Yoshifumi Tanada, Mitsuaki Osame, Aya Anzai, Ryota Fukumoto
  • Patent number: 8624808
    Abstract: 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.
    Type: Grant
    Filed: March 6, 2012
    Date of Patent: January 7, 2014
    Assignee: Ignis Innovation Inc.
    Inventors: Arokia Nathan, Gholamreza Chaji
  • Patent number: 8614655
    Abstract: A pixel circuit of an organic light emitting diode (OLED) display device is provided, which supplies a small current to an organic light emitting diode during stoppage of a display operation. The pixel circuit includes a second driving transistor, which is coupled in parallel with a first driving transistor. A gate control line is used to control the second driving transistor so that a small current can flow into the organic light emitting diode during the stoppage of the display operation. The small current is supplied through the second driving transistor to the organic light emitting diode during the stoppage of the display operation. Thus, the pixel circuit of the OLED display device can reduce or prevent an electric shock applied to the organic light emitting diode at the beginning of the display operation, thereby reducing or preventing deterioration of the characteristics of the organic light emitting diode.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: December 24, 2013
    Assignee: Samsung Display Co., Ltd.
    Inventor: Joon-Young Park
  • Patent number: 8610645
    Abstract: There is provided an active matrix EL display device that can display a clear multi gray-scale color display to reduce the shift in the potential caused by the potential drop due to the wiring resistance of a power source supply line, in order to decrease the unevenness in a display region. A plurality of drawing out ports of the power source supply line are arranged. Further, in the wiring resistance between the external input terminal and the pixel portion power source supply line, potential compensation is performed by supplying potential to the power source supply line by a feedback amplifier. Further, in addition to above structure, the power source supply line may be arranged in a matrix.
    Type: Grant
    Filed: February 27, 2012
    Date of Patent: December 17, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Jun Koyama, Hajime Kimura
  • Patent number: 8610359
    Abstract: Disclosed is a display device, the device including a light emitting part including a first electrode, an organic light emitting layer and a second electrode for radiating light of a first wavelength, a pixel part stacked on the light emitting part to radiate light of a second wavelength using a reflective light, and a capping layer arranged between the light emitting part and the pixel part to reflect the light of the first wavelength and to transmit the light of the second wavelength, whereby legibility, color reproduction range and power consumption can be enhanced.
    Type: Grant
    Filed: January 26, 2012
    Date of Patent: December 17, 2013
    Assignee: Electronics and Telecommunications Research Institute
    Inventor: Jeong Ik Lee
  • Patent number: 8605076
    Abstract: Power consumption required for charging and discharging a source signal line is reduced in an active matrix EL display device. A bipolar transistor (Bi1) has a base terminal B connected to an output terminal c1 of an operational amplifier (OP1), a collector terminal C connected to a low power potential (GND), and an emitter terminal E connected to a resistor R2. A high power potential (VBH) is a potential in synchronization with a high power potential of a light emitting element. A potential of the output terminal c1 of the operational amplifier (OP1) is outputted as a buffer low power potential (VBL). The low power potential (VBL) corresponds to a potential difference between the high power potential (VBH) and a high power potential (V1). Accordingly, the low power potential (VBL) can follow the high power potential (VBH), that is a high power potential of the light emitting element.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: December 10, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Tomoyuki Iwabuchi, Hiroyuki Miyake
  • Patent number: 8604705
    Abstract: A compensation circuit of organic light emitting diode comprising a first capacitor, a second capacitor, a stabilizer unit, a third transistor, an organic light emitting diode and a driver unit. The stabilizer unit comprises a first transistor, a second transistor and a photodiode. The driver unit comprises a fourth transistor, a fifth transistor and a sixth transistor. The fifth transistor is used for driving the organic light emitting diode. The first transistor, the second transistor, the third transistor, the fourth transistor and the sixth transistor are used as switches. The first capacitor is used as a compensation capacitor. The second capacitor is used for storing a data voltage. By controlling a voltage of a node in the circuit, the current of the organic light emitting diode can be increased to maintain a stable brightness of the organic light emitting diode.
    Type: Grant
    Filed: January 26, 2012
    Date of Patent: December 10, 2013
    Assignee: Hannstar Display Corporation
    Inventors: Chien-Chuan Ko, Chao-Hui Wu
  • Patent number: 8604704
    Abstract: A light emitting device capable of performing signal electric current write-in operations at high speed and without dispersion in the characteristics of TFTs structuring pixels influencing the brightness of light emitting elements is provided. The gate length L of a transistor in which an electric current flows during write-in of a signal electric current is made shorter than the gate length L of a transistor in which electric current supplied to EL elements flows during light emission, and high speed write-in is thus performed by having a larger electric current flow than the electric current flowing in conventional EL elements. A converter and driver transistor (108) is used for signal write-in.
    Type: Grant
    Filed: February 13, 2013
    Date of Patent: December 10, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Hajime Kimura
  • Patent number: 8599178
    Abstract: A transistor connected to a power source for driving a light-emitting element driving transistor and a transistor setting to a predetermined voltage a source voltage of the light-emitting element driving transistor are commonly controlled by a control signal that takes one of three levels.
    Type: Grant
    Filed: April 13, 2011
    Date of Patent: December 3, 2013
    Assignee: Sony Corporation
    Inventors: Katsuhide Uchino, Tetsuro Yamamoto, Junichi Yamashita
  • Patent number: 8593449
    Abstract: A reference voltage generation circuit of the disclosure includes a first amplifier circuit and a second amplifier circuit. The first amplifier circuit includes a first input stage including two npn transistors or two NMOS transistors having base terminals or gate terminals to which a variable voltage and a predetermined lower limit voltage are inputted. A first output stage includes a pnp transistor or a PMOS transistor having an emitter terminal or a source terminal connected to an output terminal of a reference voltage. A first amplifier stage controls the first output stage for equalizing the higher one of the variable voltage and the lower limit voltage with the reference voltage.
    Type: Grant
    Filed: May 27, 2011
    Date of Patent: November 26, 2013
    Assignee: Rohm Co., Ltd.
    Inventor: Kazuhiro Murakami
  • Patent number: 8587566
    Abstract: A driver for driving a display panel having a light emitting element includes a plurality of control pads, each of which is electrically connected to a control line of the display panel; and a plurality of power source pads, each of which is electrically connected to a power source line of the display panel and is larger in area than the control pad. The control pads and the power source pads are arranged in line and an order of arrangement of the control pads and the power source pads is symmetrical with respect to a direction of pad arrangement.
    Type: Grant
    Filed: June 23, 2005
    Date of Patent: November 19, 2013
    Assignees: Kyocera Corporation, Chi Mei Optoelectronics Corp., Chimei Innolux Corporation
    Inventors: Shinya Ono, Yoshinao Kobayashi, Kohichi Miwa
  • Patent number: 8587215
    Abstract: Lighting devices and operating methods are presented in which voltage or current perturbations of an OLED caused by a user pressing the OLED are monitored while the OLED is providing general lighting, and one or more lighting control signals are generated based on the sensed perturbations.
    Type: Grant
    Filed: May 5, 2011
    Date of Patent: November 19, 2013
    Assignee: General Electric Company
    Inventors: Bruce Richard Roberts, Deeder Aurongzeb, Josip Brnada
  • Patent number: 8581805
    Abstract: A display device having a pixel configuration in which the aperture ratio is not decreased, and a driving method of a display device in which the duty ratio and the reliability of a light emitting element are increased. According to the invention, a signal line for inputting an analog signal, a first switch controlled by a first scan line, a second switch controlled by a second scan line, and a light emitting element connected to the second switch are included, wherein the first switch and the second switch are selected and an analog signal is inputted in a first period of one gate selection period, the first switch is selected and a reference signal is inputted from the signal line in a second period of the one gate selection period, and the light emitting element emits light by the analog signal and the reference signal.
    Type: Grant
    Filed: May 18, 2005
    Date of Patent: November 12, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Hajime Kimura, Jun Koyama, Masahiko Hayakawa, Yu Yamazaki, Yukari Ando, Keisuke Miyagawa
  • Patent number: 8569958
    Abstract: To provide a light emitting device without nonuniformity of luminance, a correcting circuit for correcting a video signal supplied to each pixel to a light emitting device. The correcting circuit is stored with data of a dispersion of a characteristic of a driving TFT among pixels and data of a change over time of luminance of a light emitting element. Further, by correcting a video signal inputted to the light emitting device in conformity with a characteristic of the driving TFT of each pixel and a degree of a deterioration of the light emitting element based on the over-described two data, nonuniformity of luminance caused by a deterioration of an electroluminescent layer and nonuniformity of luminance caused by dispersion of a characteristic of the driving TFT are restrained.
    Type: Grant
    Filed: August 9, 2012
    Date of Patent: October 29, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shunpei Yamazaki, Hajime Kimura, Mai Akiba, Aya Anzai, Yu Yamazaki
  • Patent number: 8558769
    Abstract: 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: Grant
    Filed: February 10, 2012
    Date of Patent: October 15, 2013
    Assignee: Sony Corporation
    Inventor: Akira Yumoto
  • Patent number: 8552653
    Abstract: An electro-optical device includes a first pixel circuit which is disposed so as to correspond to each intersection between a scanning line and a first data line, a second pixel circuit which is disposed so as to correspond to each intersection between a scanning line and a second data line, a signal line, a selection section, a driving circuit. In a first selection period, the selection section is operated such that the first data line and the second data line are electrically connected to the signal line. In the second selection period, the selection section is operated such that the second data line is electrically connected to the signal line. In a writing period, the first data potential is supplied to the first pixel circuit and the second data potential is supplied to the second pixel circuit.
    Type: Grant
    Filed: November 14, 2011
    Date of Patent: October 8, 2013
    Assignee: Seiko Epson Corporation
    Inventors: Takayuki Kitazawa, Takehiko Kubota, Toshiyuki Kasai
  • Patent number: 8547299
    Abstract: Provided is a pulse drive-type field emission device. The pulse drive-type field emission device includes anode and cathode substrates that are spaced apart from and face each other, a cathode electrode formed on the cathode substrate, and a field emitter formed on the cathode electrode. The pulse drive-type field emission device further includes a metal mesh-type gate electrode having an opening through which electrons emitted from the field emitter pass and a power source which applies a compensated pulse wave power to the gate electrode or the cathode electrode to compensate for vibration of the gate electrode. Thus, noise from the metal mesh can be prevented without additional fabrication processes by modifying a waveform in pulse driving.
    Type: Grant
    Filed: October 7, 2009
    Date of Patent: October 1, 2013
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jin Woo Jeong, Yoon Ho Song
  • Patent number: 8547315
    Abstract: The invention provides an active matrix EL display device which can perform a clear multi-gray scale color display. In particular, the invention provides a large active matrix EL display device at low cost by a manufacturing method which can selectively form a pattern. Power supply lines in a pixel portion are arranged in matrix by the manufacturing method which can selectively form a pattern. Further, capacitance between wirings is reduced by providing a longer distance between adjacent wirings by the manufacturing method which can selectively form a pattern.
    Type: Grant
    Filed: July 3, 2012
    Date of Patent: October 1, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Yasunori Yoshida, Hajime Kimura, Shinji Maekawa, Osamu Nakamura, Shunpei Yamazaki
  • Patent number: 8537080
    Abstract: A drive section sequentially supplies respective scanning lines with a control signal and supplies respective signal lines with a video signal to carry out a correction operation for holding a voltage equivalent to a threshold voltage of a drive transistor in a holding capacitance, and subsequently performs a write operation for writing the video signal in the holding capacitance, and before the correction operation, the drive section switches potentials at the bias line and adds a coupling voltage to one current terminal of the drive transistor via an auxiliary capacitance to carry out a preparation operation for an initialization to set a potential difference between a control terminal and the one current terminal of the drive transistor larger than the threshold voltage.
    Type: Grant
    Filed: October 27, 2011
    Date of Patent: September 17, 2013
    Assignee: Sony Corporation
    Inventors: Junichi Yamashita, Katsuhide Uchino
  • Patent number: 8519628
    Abstract: The amplitude of a potential of a signal line is decreased and a scan line driver circuit is prevented from being excessively loaded. A light-emitting device includes a light-emitting element; a first power supply line having a first potential; a second power supply line having a second potential; a first transistor for controlling a connection between the first power supply line and the light-emitting element; a second transistor, which is controlled in accordance with a video signal, whether outputting the second potential applied from the second power supply line or not; a switching element for selecting either the first potential applied from the first power supply line or the output of the second transistor; and a third transistor for selecting whether the first potential or the output of the second transistor which is selected by the switch is applied to a gate of the first transistor.
    Type: Grant
    Filed: October 24, 2011
    Date of Patent: August 27, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Ryota Fukumoto, Hiroyuki Miyake, Yoshifumi Tanada, Kei Takahashi
  • Patent number: 8519627
    Abstract: Provided is a field emission device having a simple structure and capable of pulse driving and local dimming. The field emission device turns a current flowing from each cathode electrode block on or off in response to a switching control signal having a very low voltage ranging from 0 to 5 V while a constant voltage is applied to an anode electrode and a gate electrode to control a field emission current. Compared with a conventional field emission device, the field emission device having a simple structure is capable of pulse driving and local dimming without using a separate pulse driving high voltage power source.
    Type: Grant
    Filed: July 14, 2009
    Date of Patent: August 27, 2013
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jin Woo Jeong, Yoon Ho Song, Dong Il Kim, Jun Tae Kang, Ji Seon Kim
  • Patent number: 8514207
    Abstract: Image processing and corresponding apparatus, methods and systems. The image processing includes controlling n number of data-line driver circuits included in a display apparatus, the data-line driver circuit driving n number of subpixels. Such controlling causes to display a moving picture image such that frame information of the moving picture image with first frame rate is displayed at a second frame rate, which is 1/n of the first frame rate, and the n number of subpixels included in each pixel are sequentially driven with a time shift, the time shift being 1/n of display period of single frame with the second frame rate.
    Type: Grant
    Filed: August 26, 2009
    Date of Patent: August 20, 2013
    Assignee: Sony Corporation
    Inventor: Yoshihiko Kuroki
  • Patent number: 8513897
    Abstract: An OLED display with a current stabilizing device employs a current stabilizing device which is coupled between the driving-voltage line of the data driver and the data-power-supply wires to produce an output voltage higher than the driving voltage by boosting the driving voltage of the data driver, and then to maintain the current of the OLEDs at a constant level by performing current limiting, so that the problem of the current-ununiformity caused uneven luminance of the conventional OLED display can be solved, and the possibility that the luminance of the OLED panel will decay in a short period of time is reduce.
    Type: Grant
    Filed: October 1, 2010
    Date of Patent: August 20, 2013
    Assignee: Winstar Display Co., Ltd
    Inventors: Yu-Pin Liao, Ying-Ju Liu, Chih-Wei Chiang
  • Patent number: 8507801
    Abstract: A printed wiring board is formed by adhering a coverlay film having a resistance layer formed on a surface of the coverlay film body to a printed wiring board body having a conductive layer formed on a surface of a substrate through an adhesive layer. The resistance layer is separated from and opposed to the conductive layer through the adhesive layer.
    Type: Grant
    Filed: August 18, 2009
    Date of Patent: August 13, 2013
    Assignee: Shin-Etsu Polymer Co., Ltd.
    Inventors: Toshiyuki Kawaguchi, Kazutoki Tahara, Tsutomu Saga
  • Patent number: 8502724
    Abstract: To provide a semiconductor device including an A/D converter circuit that is capable of performing A/D conversion with high accuracy and high resolution and that can be reduced in size. One loop resistance wiring is shared by a plurality of power supply switches and a plurality of output circuits, and a reference voltage having a triangular (step-like) wave generated using the resistance wiring and the plurality of power supply switches is utilized. Thus, high-accuracy digital signals can be obtained using such an A/D converter circuit that can be reduced in size as an output circuit, without using a complicated circuit structure. Further, the number of constituent elements of the A/D converter circuit is small, whereby in the case of providing A/D converter circuits in parallel, variation between the A/D converter circuits can be made small.
    Type: Grant
    Filed: March 28, 2012
    Date of Patent: August 6, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Yoshiyuki Kurokawa
  • Patent number: 8497856
    Abstract: A light emitting device includes a pixel circuit and a driving circuit, the pixel circuit including a driving transistor, a light emitting element, a first capacitance element interposed between a gate and a source of the driving transistor, a selection transistor, a current generating unit which generates set current. The driving circuit controls the current generating unit to generate set current with a predetermined magnitude in a current set period before a writing period of writing data potential in the pixel circuit, to set the voltage (voltage between both ends of the first capacitance element) between the gate and the source of the driving transistor to a value necessary to allow the set current to flow in the driving transistor.
    Type: Grant
    Filed: February 16, 2011
    Date of Patent: July 30, 2013
    Assignee: Seiko Epson Corporation
    Inventor: Hitoshi Ota
  • Patent number: 8492999
    Abstract: A method for controlling electrical power of light emission diodes (LED) is provided. The above method comprises steps of providing a supply voltage to the LED driver; providing a driving current to the LED by the LED driver; obtaining an operating voltage of the LED; and adjusting the supply voltage according to the operating voltage of the LED.
    Type: Grant
    Filed: March 17, 2010
    Date of Patent: July 23, 2013
    Assignee: Lumens Digital Optics Inc.
    Inventor: Wen-Chin Cheng
  • Patent number: 8471792
    Abstract: A display device includes a data line, a first and second pixel rows and a first and second gate control lines all formed on a substrate. The first pixel row includes a plurality of pixels each containing two neighboring first sub-pixel and second sub-pixel, the first sub-pixel is coupled to the data line, the second sub-pixel is coupled to the data line through the first sub-pixel. The second pixel row is neighboring with the first pixel row and includes a plurality of pixels each containing two neighboring third sub-pixel and fourth sub-pixel, the third sub-pixel is coupled to the data line, the fourth sub-pixel is coupled to the data line through the third sub-pixel. The first and second gate control lines respectively are for enabling the first and second sub-pixels and both are not used to enable the third and fourth sub-pixels. A driving method of gate control lines also is provided.
    Type: Grant
    Filed: February 17, 2009
    Date of Patent: June 25, 2013
    Assignee: AU Optronics Corp.
    Inventors: Ken-Ming Chen, Chi-Mao Hung
  • Patent number: 8466855
    Abstract: A pixel, for displaying an image of desired brightness, includes an organic light emitting diode (OLED); a first transistor for controlling an amount of current supplied from a first power source to the organic light emitting diode; a capacitor having a first terminal coupled to a first node as a gate electrode of the first transistor; a plurality of second transistors coupled between a second node as a second terminal of the capacitor and a data line and turned on when a scan signal is supplied to a scan line; another capacitor having a terminal coupled to the second node; and for compensating inferiority of the OLED in displaying an image of desired brightness, a compensator coupled to the plurality of second transistors and a predetermined power source and turned off when a light emission control signal is supplied to a light emission control line.
    Type: Grant
    Filed: December 16, 2010
    Date of Patent: June 18, 2013
    Assignee: Samsung Display Co., Ltd.
    Inventor: Sam-Il Han
  • Patent number: 8450936
    Abstract: The disclosed power supply is compatible with two voltage ranges, the midpoint or mean of the higher voltage range being approximately double the midpoint or mean of the lower voltage range. Two equivalent loads and two current sources are re-configured using a relay in response to a detected input voltage exceeding a pre-determined threshold voltage. The disclosed circuit re-configures the load being driven to match the input voltage, rather than re-configuring the voltage to match the load.
    Type: Grant
    Filed: May 13, 2010
    Date of Patent: May 28, 2013
    Assignee: Whelen Engineering Company, Inc.
    Inventor: James L. Stopa
  • Patent number: 8432101
    Abstract: A display device includes a display unit in which display elements provided with pixel circuits are arranged so as to have a sequence of three different colors in a row direction and the colors are shifted in a column direction by 1.5 columns. A scanning line is provided in every row of the display unit, a signal line is provided in every column of the display unit, and a column control circuit outputs a display signal for every column. The positions of the pixel circuits are displaced in the row direction with respect to the arrangement of the display elements, and are thus aligned in the column direction and also connected to the signal line only on one side of the signal line. No inversion of the pixel circuit pattern occurs and variations of the circuit characteristics in every row are suppressed.
    Type: Grant
    Filed: August 31, 2011
    Date of Patent: April 30, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Somei Kawasaki, Masami Iseki, Tatsuhito Goden