News Column

Patent Issued for Organic Light Emitting Display

September 3, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventor Kim, Min-Cheol (Yongin, KR), filed on September 23, 2011, was published online on August 19, 2014.

The assignee for this patent, patent number 8810484, is Samsung Display Co., Ltd. (Yongin-si, KR).

Reporters obtained the following quote from the background information supplied by the inventors: "Embodiments of the present invention relate to an organic light emitting display.

"Recently, various flat panel displays (FPDs) capable of reducing weight and volume, which are disadvantages of cathode ray tubes (CRTs), have been developed. The types of FPDs include liquid crystal displays (LCDs), field emission displays (FEDs), plasma display panels (PDPs), and organic light emitting displays.

"Among the FPDs, the organic light emitting displays display images using organic light emitting diodes (OLEDs) that generate light by the re-combination of electrons and holes. The organic light emitting display has high response speed and is driven with low power consumption.

"The organic light emitting display includes a plurality of pixels arranged at crossing regions of a plurality of data lines, scan lines, and power source lines in a matrix. Generally, each of the pixels includes an organic light emitting diode (OLED), at least two transistors including a driving transistor, and at least one capacitor.

"When the FPD is driven, a method of performing impulsive driving such as black data insertion (BDI) is provided in the middle of (e.g., during) a frame to improve the picture quality of a moving picture. Therefore, in some FPDs, black data is supplied to the pixels and black is displayed in accordance with the supplied black data.

"However, generally, when black data and a scan signal corresponding to the black data are supplied in order to display black, power consumption is not reduced. In addition, generally, when a black image is inserted using black data, a desired black image is not displayed due to leakage current (e.g., the FPD may still emit light due to leakage current)."

In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventor's summary information for this patent: "Accordingly, embodiments of the present invention have been made to provide an organic light emitting display capable of reducing power consumption.

"According to one embodiment of the present invention, an organic light emitting display includes a display unit comprising a plurality of pixels at crossing regions of a plurality of scan lines, a plurality of data lines, and a plurality of emission control lines, the display unit being divided into at least i blocks, wherein i is a natural number greater than 1, each of the blocks comprising a plurality of corresponding scan lines of the scan lines, a plurality of i scan drivers each coupled to a corresponding one of the blocks for supplying a plurality of scan signals to the corresponding scan lines, a plurality of emission drivers included in the blocks for supplying a plurality of emission control signals to the emission control lines, each of the blocks comprising a plurality of corresponding emission control lines of the emission control lines, a data driver for supplying a plurality of data signals to the data lines, and a timing controller for controlling the scan drivers, the emission drivers, and the data driver and for supplying a plurality of emission block control signals to control light emission of the pixels, wherein the pixels in a same one of the blocks are configured to receive a same one of the emission block control signals and wherein the pixels are configured to be set in a non-emission state when the pixels receive a corresponding one of the emission block control signals.

"The timing controller may be configured to stop the supply of the data signals and the scan signals to a block of the blocks which is set in the non-emission state. The organic light emitting display may further include a plurality of first switching elements between a plurality of corresponding first scan stages of the scan drivers and a start signal transmission line. The timing controller may be further configured to supply a plurality of scan control signals to the first switching elements at different times and the first switching elements may be configured to be turned on by the scan control signals. The timing controller may be configured to supply i start signals during one frame period and the timing controller may be configured to supply i-1 scan control signals are supplied to overlap i-1 of the i start signals. In one embodiment, the scan control signals do not overlap with one another.

"Each of the scan control signals may overlap a corresponding start signal of the start signals and the timing controller may be configured to stop supplying the scan control signals corresponding to a first start signal of the start signals before supplying a second start signal of the start signals after the first start signal is supplied. A scan control signal may be supplied to a first switching element of the first switching elements in a kth (k is a natural number) block does not overlap an emission block control signal of the emission control signals supplied to the kth block. Each of the emission block control signals may have a width larger than a width of each of the scan control signals. Each of the scan drivers may be configured to sequentially supply scan signals to the scan lines of the scan lines coupled thereto in accordance with receiving a start signal of a plurality of start signals. The display unit may be divided into at least four even blocks and at least two blocks of the at least four even blocks may be configured to receive the same emission block control signal and the same scan control signal.

"Each of the pixels may include an organic light emitting diode (OLED), a pixel circuit coupled to a data line of the data lines and a scan line of the scan lines to control an amount of current supplied to the OLED, a first transistor coupled between the pixel circuit and the OLED and configured to be turned off when an emission block control signal of the emission block control signals is supplied, and a second transistor coupled between a first power source and the pixel circuit and having a gate electrode coupled to an emission control line of the emission control lines. Each of the pixels may further include a third transistor coupled between a gate electrode of the second transistor and the emission control line and configured to be turned off when the emission block control signal is supplied. The organic light emitting display may further include a plurality of third transistors coupled between a corresponding one of the emission control lines and a corresponding one of the emission drivers and configured to be turned off when the emission block control signal is supplied.

"In the organic light emitting display according to embodiments of the present invention, a panel is divided into a plurality of blocks and the pixels included in the block are simultaneously turned off so that a black image may be inserted. In particular, according to embodiments of the present invention, because a scan signal and a data signal are not supplied to a block that displays the black image, a driving frequency may be reduced and, at the same time, power consumption may be reduced."

For more information, see this patent: Kim, Min-Cheol. Organic Light Emitting Display. U.S. Patent Number 8810484, filed September 23, 2011, and published online on August 19, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8810484.PN.&OS=PN/8810484RS=PN/8810484

Keywords for this news article include: Electronics, Light-emitting Diode, Samsung Display Co. Ltd.

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Source: Electronics Newsweekly


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