News Column

Patent Issued for Backplane Structures for Organic Light Emitting Electronic Devices Using a TFT Substrate

July 23, 2014



By a News Reporter-Staff News Editor at Journal of Engineering -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventors Tsai, Yaw-Ming A. (Pak Shek Kok, HK); Parker, Ian D. (Santa Barbara, CA); Meinel, Ines (Santa Barbara, CA), filed on December 11, 2008, was published online on July 8, 2014.

The assignee for this patent, patent number 8772774, is E. I. du Pont de Nemours and Company (Wilmington, DE).

Reporters obtained the following quote from the background information supplied by the inventors: "This disclosure relates in general to electronic devices and processes for forming the same. More specifically, it relates to backplane structures and devices formed using the backplane structures.

"Electronic devices, including organic electronic devices, continue to be more extensively used in everyday life. Examples of organic electronic devices include organic light-emitting diodes ('OLEDs'). The devices are formed on backplanes having active matrix circuitry with thin film transistors ('TFTs'). There will be several organic layers with the OLED as well as several inorganic layers in the backplane. Due to the multiple layers, OLEDs exhibit what is know as a 'weak cavity' effect. This is an optical interference phenomenon which influences the emission colors of the emitting materials.

"To best match the emission colors, typically red, green, and blue, to match the display specifications, a different optimized cavity could be formed for each color. However, due to production cost and throughput considerations, this is not practical.

"In addition, when emission is through the bottom of the backpanel, the dielectric layers in the TFT can also create optical interference and change the emission color.

"Thus, there is a need for device structures that will allow for the flexibility to correct for the above problems to produce the desired emission colors."

In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "There is a provided a backplane for an organic electronic device having a multiplicity of pixel areas, the backplane comprising:

"a TFT substrate comprising a base substrate, a polysilicon layer, a gate dielectric layer, a gate electrode, an interlayer dielectric, and a data electrode;

"an insulating layer over the TFT substrate;

"a multiplicity of first openings in the insulating layer having a depth d1;

"a multiplicity of pixelated diode electrode structures, wherein a first set of diode electrode structures are in the first openings;

"a bank structure defining pixel areas over the diode electrode structures;

"wherein the first openings and first set of diode electrode structures are in at least a first set of the pixel areas.

"There is also provided a backplane as described above, having a multiplicity of second openings in the insulating layer having a depth d2, wherein a second set of diode electrode structures are in the second openings, and the second openings are in a second set of pixel areas.

"There is also provided a backplane as described above, having a multiplicity of third openings in the insulating layer having a depth d3, wherein a third set of diode electrode structures are in the third openings, and the third openings are in a third set of pixel areas.

"There is also provided an organic electronic device comprising organic active layers formed in the pixel openings of any of the above backplanes.

"The foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as defined in the appended claims."

For more information, see this patent: Tsai, Yaw-Ming A.; Parker, Ian D.; Meinel, Ines. Backplane Structures for Organic Light Emitting Electronic Devices Using a TFT Substrate. U.S. Patent Number 8772774, filed December 11, 2008, and published online on July 8, 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=8772774.PN.&OS=PN/8772774RS=PN/8772774

Keywords for this news article include: Nanotechnology, Organic Electronic, Emerging Technologies, E. I. du Pont de Nemours and Company.

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


For more stories covering the world of technology, please see HispanicBusiness' Tech Channel



Source: Journal of Engineering


Story Tools






HispanicBusiness.com Facebook Linkedin Twitter RSS Feed Email Alerts & Newsletters