News Column

"Organic Light Emitting Display" in Patent Application Approval Process

August 7, 2014



By a News Reporter-Staff News Editor at Politics & Government Week -- A patent application by the inventors Jung, Hae-Goo (Yongin-City, KR); Ryu, Do-Hyung (Yongin-City, KR), filed on June 13, 2013, was made available online on July 24, 2014, according to news reporting originating from Washington, D.C., by VerticalNews correspondents.

This patent application has not been assigned to a company or institution.

The following quote was obtained by the news editors from the background information supplied by the inventors: "The present invention relates to an organic light emitting display capable of reducing deterioration speed of a pixel.

"An organic light emitting diode (OLED) emits light by a difference in energy in a process where holes injected through an anode electrode and electrons injected through a cathode electrode are recombined in an organic light emitting layer. At this time, the emitted light may have different wavelengths, for example, red, green, and blue wavelengths in accordance with the organic light emitting layer. The wavelength of the emitted light is determined by a material (including host material and a dopant material) of the organic light emitting layer.

"Since a characteristic of a part of the material of the organic light emitting layer is deteriorated in accordance with atmosphere and emission time, brightness of the light emitted from the OLED is gradually reduced. For example, meanwhile a brightness reduction ratio of an organic light emitting layer that emits light of green wavelength in accordance with time is relatively small, as brightness is rapidly reduced after a time in an organic light emitting layer that emits light of green wavelength. Therefore, due to a difference in the brightness reduction ratio caused by a difference in the characteristics of the materials, a difference in brightness is generated between OLEDs.

"In addition, when the same image such as a logo, a time, and subtitles of a broadcaster is continuously displayed at a specific position, deterioration of the OLEDs may be accelerated. Due to deterioration caused by a long-time operation, an afterimage or image sticking may be generated. A spot caused by the afterimage may deteriorate picture quality."

In addition to the background information obtained for this patent application, VerticalNews journalists also obtained the inventors' summary information for this patent application: "Accordingly, the present invention has been made to provide an organic light emitting display capable of reducing deterioration speed of an organic light emitting diode (OLED).

"The present invention has been also made to provide an organic light emitting display capable of preventing an afterimage from being generated.

"According to one aspect of the present invention, there is provided an organic light emitting display that includes a plurality of pixels arranged in a plurality of rows and columns, wherein each of the pixels comprises a plurality of sub pixels, and wherein at least one of the plurality of sub pixels of at least one of the pixels includes a plurality of divisional sub pixels. The plurality of sub pixels may include a red sub pixel, a green sub pixel, and a blue sub pixel, each of the red sub pixel, the green sub pixel, and the blue sub pixel may be divided into a plurality of divisional sub pixels. Each of the red sub pixel, the green sub pixel, and the blue sub pixel may be composed of differing numbers of divisional sub pixels, respectively. The plurality of sub pixels are may include a red sub pixel, a green sub pixel, and a blue sub pixel, and only the blue sub pixel may be divided into a plurality of divisional sub pixels.

"The divisional sub pixels within one of the sub-pixels may alternately emit light. The plurality of divisional sub pixels within any one of the sub-pixels may alternately emit light within a frame cycle or a time cycle. The plurality of divisional sub pixels may alternately emit light within a frame cycle or a time cycle corresponding to when accumulated operation time of the organic light emitting display is no less than a predetermined value.

"The organic light emitting display device may also include a plurality of scan lines, each being coupled to a plurality of sub pixels in a row; and a plurality of data lines, each being coupled to a plurality of sub pixels in a column. The plurality of divisional sub pixels within a single sub pixel are coupled to the scan lines of different rows, respectively. The plurality of divisional sub pixels within a single sub pixel may be coupled to a same one of the data lines. The organic light emitting display device may also include a scan driver coupled to the plurality of scan lines and a data driver coupled to the plurality of data lines.

"A same image is displayed on at least one pixel for a predetermined time. The at least one pixel that includes the sub pixels that include a plurality of divisional sub pixels may be intensively provided in a predetermined region of the plurality of rows and columns. The predetermined region may be a region adjacent to an edge of the plurality of rows and columns. The predetermined region may be a region adjacent to a corner of the plurality of rows and columns.

"Ones of the plurality of divisional sub pixels within one of the sub pixels of a pixel may emit light of a same color and may be independently controlled by being connected to a separate signal lines. All of the pixels may include at least one sub pixel that includes a plurality of divisional sub pixels that are independently controlled. Only a portion of all of the pixels are may include at least one sub pixel that includes a plurality of divisional sub pixels that are independently controlled and emits light of a same color. Each divisional sub pixels within a sub pixel emit light of a same color and are adapted to be driven in an alternate manner. All of the divisional sub pixels within a sub pixel emit a same color of light, and all of the sub pixels within a pixel may emit different color light from each other, and each of the divisional sub pixels within a sub pixel may be independently controlled.

BRIEF DESCRIPTION OF THE DRAWINGS

"A more complete appreciation of the invention, and many of the attendant advantages thereof, will be readily apparent as the same becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings, in which like reference symbols indicate the same or similar components, wherein:

"FIG. 1 is a block diagram illustrating an organic light emitting display according to an embodiment of the present invention;

"FIGS. 2A to 2C are plan views illustrating an embodiment of the pixel illustrated in FIG. 1 in detail;

"FIG. 3 is a plan view illustrating a coupling structure between sub pixels and scan lines and data lines for alternately emitting light for the pixel of FIG. 2A;

"FIG. 4 is a plan view of a display unit illustrating an organic light emitting display according to an embodiment of the present invention; and

"FIGS. 5A and 5B are plan views of a pixel for describing FIG. 4."

URL and more information on this patent application, see: Jung, Hae-Goo; Ryu, Do-Hyung. Organic Light Emitting Display. Filed June 13, 2013 and posted July 24, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=3745&p=75&f=G&l=50&d=PG01&S1=20140717.PD.&OS=PD/20140717&RS=PD/20140717

Keywords for this news article include: Patents, Electronics, Light-emitting Diode.

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


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Source: Politics & Government Week


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