News Column

Patent Issued for Organic Light Emitting Display

September 10, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- A patent by the inventor Choi, Sang-Moo (Yongin, KR), filed on November 9, 2010, was published online on August 26, 2014, according to news reporting originating from Alexandria, Virginia, by VerticalNews correspondents.

Patent number 8816362 is assigned to Samsung Display Co., Ltd. (Yongin-is, KR).

The following quote was obtained by the news editors from the background information supplied by the inventors: "One or more embodiments of the present invention relate to an organic light emitting display.

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

"Among the FPDs, the organic light emitting display displays images using organic light emitting diodes (OLEDs) that generate light by the recombination of electrons and holes. The organic light emitting display has advantages of a high response speed while being driven with low power consumption.

"The organic light emitting display includes a plurality of pixels arranged at crossing regions of data lines and scan lines in the form of a matrix. In general, each of the pixels includes an OLED, at least two transistors, and at least one capacitor.

"In an organic light emitting display, an amount of current that flows to the OLED varies with the threshold voltage variation of the driving transistor included in each of the pixels and non-uniform displaying may therefore occur. That is, properties of the driving transistor, such as its threshold voltage, vary with the manufacturing process of the driving transistor included in each of the pixels, making it very difficult to manufacture all transistors of the organic light emitting display to have the same properties using current manufacturing technologies. Therefore, the threshold voltage variation of the driving transistors occurs.

"In order to solve the above-mentioned problems, a pixel including six transistors and at least one capacitor was suggested in Korean Patent Publication No. 2007-0083072. The conventional pixel is coupled to a plurality of wiring lines including an initialization lines coupled to an initialization power source.

"FIG. 1 is a view illustrating a related art wiring line structure for a group of sub pixels. In FIG. 1, for the sake of convenience, the internal structure of the sub pixels is omitted.

"Referring to FIG. 1, related art sub pixels 2R, 2G, and 2B are located at crossing regions of data lines Di, Di+1, and Di+2, respectively, and a scan line Si. The red sub pixel 2R coupled to the i.sup.th data line Di and the i.sup.th scan line Si is additionally coupled to power source lines 10a and 10b and initialization lines 12a and 12b.

"Of the power source lines 10a and 10b, the first power source line 10a is parallel to the data line Di and receives power from a first power source ELVDD, which may be externally supplied. The first power source line 10a is electrically coupled to a transistor included in the red sub pixel 2R and supplies the voltage of the first power source ELVDD to the red sub pixel 2R.

"Of the power source lines 10a and 10b, the second power source line 10b is parallel to the scan line Si and is electrically coupled to the first power source line 10a by a first contact hole 20. The second power source line 10b is coupled to the first power source line 10a to reduce or minimize a voltage drop of the first power source ELVDD.

"Of the initialization lines 12a and 12b, the first initialization line 12a is parallel to the data line Di and is coupled to an initialization power source Vint. The first initialization line 12a is electrically coupled to a transistor included in the red sub pixel 2R and supplies a voltage of the initialization power source Vint to the red sub pixel 2R.

"Of the initialization lines 12a and 12b, the second initialization line 12b is parallel to the scan line Si and is electrically coupled to the first initialization line 12a by a second contact hole 22. The second initialization line 12b is coupled to the first initialization line 12a to reduce or minimize a voltage drop of the initialization power source Vint.

"However, since each of the above sub pixels 2R, 2G, and 2B is coupled to six wiring lines, a layout structure is complicated and an aperture ratio is reduced. For example, as each of the sub pixels 2R, 2G, and 2B is coupled to a plurality of wiring lines, yield is reduced so that manufacturing cost increases."

In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventor's summary information for this patent: "Accordingly, an aspect of embodiments according to the present invention provides an organic light emitting display capable of reducing or minimizing the number of wiring lines to improve an aperture ratio.

"In order to achieve the foregoing and/or other aspects of the present invention, according to an embodiment of the present invention, there is provided an organic light emitting display, including scan lines and data lines crossing each other at crossing regions, sub pixels located at the crossing regions and configured to display an image in accordance with an amount of current that flows from a first power source to respective organic light emitting diodes in the sub pixels, and first power source lines parallel to the data lines, each of the first power source lines corresponding to at least two of the data lines, the first power source lines including a first group of the first power source lines configured to receive a first power from the first power source and a second group of the first power source lines that are different from the first group and configured to receive a second power from a second power source.

"The first power source lines may be located at substantially the same distance from each other.

"At least two adjacent ones of the first power source lines are organized as a block.

"The block may include at least one of the second group of the first power source lines.

"The organic light emitting display may further include second power source lines that are parallel to the scan lines and electrically coupled to the first group of the first power source lines via first contact holes.

"The second power source lines may be electrically coupled to the sub pixels.

"Each of the second power source lines may be located at a corresponding one of horizontal lines.

"The organic light emitting display may further include third power source lines that are parallel to the scan lines and electrically coupled to the second group of the first power source lines via second contact holes.

"Each of the third power source lines may be located at a corresponding one of horizontal lines.

"According to another embodiment of the present invention, there is provided an organic light emitting display including scan lines and data lines crossing each other at crossing regions, sub pixels located at the crossing regions and configured to display an image in accordance with an amount of current that flows from a first power source to respective organic light emitting diodes in the sub pixels, and first power source lines that are parallel to the data lines, each of the first power source lines corresponding to at least two of the data lines.

"The organic light emitting display may further include second power source lines that are parallel to the scan lines, each of the second power source lines being located at a corresponding one of horizontal lines and electrically coupled to the first power source lines via first contact holes.

"In the organic light emitting display according to embodiments of the present invention, since one first power source line is provided for every at least two data lines, the number of wiring lines may be reduced or minimized. In addition, in the first power source lines, a first group of first power source lines receives a first power source and the second group of first power source line receives a power source different from the first power source. That is, according to embodiments of the present invention, at least two power sources may be supplied to sub pixels using the first power source lines separated from each other by substantially the same distance so that a wiring line structure may be simplified."

URL and more information on this patent, see: Choi, Sang-Moo. Organic Light Emitting Display. U.S. Patent Number 8816362, filed November 9, 2010, and published online on August 26, 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=8816362.PN.&OS=PN/8816362RS=PN/8816362

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

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Electronics Newsweekly


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