Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

"Green" OLED-Displays - High Image Quality at Low Energy

14.10.2009
Chihao Xu, professor for microelectronics at Saarland-University, has achieved a breakthrough in power-efficient driving of OLED-displays.

They are regarded as displays of the future - organic light emitting diode-displays - called OLED-displays in short. This technology is already applied in mobile phones, MP3-players and digital cameras.

It is based on the phenomenon that certain organic materials emit light, when fed by an electric current. The new OLED-displays can be thin as a film and just as flexible. Furthermore they have a wide viewing angle and display videos perfectly. A further benefit is that these displays need little energy.

"Compared to the present standard, more than the half of the energy can be saved for the OLED-display-operation", Chihao Xu stated. "Especially for mobile applications, saving of energy is reasonable" explains the professor. The display consumes most of the energy in mobile devices such as the mobile phone. Especially by charging and discharging a lot of energy gets lost". The scientists from Saarbrücken are searching for avoiding this high power loss.

This shall be achieved by the new driving scheme SQC (State dependent Charge controlled Driving) for actuating passive matrix OLED-displays. This scheme will substantially reduce the power consumption especially for high resolution displays, and will naturally guarantee the known excellent image quality of an OLED-display.

The microelectronics group of Saarland University is worldwide leading in the field of the OLED-driving. Within the CARO-project (CAR OLED) Chihao Xu and his team together with partners from science and industry, such as Optrex Europe GmbH and the Fraunhofer Institute for Photonic Microsystems (PIMS), participated in the development of a new driver chip, which shall be implemented in OLED-displays for cars. In this project, a new multi-line addressing scheme ("SELA", Summed Equi-Line-Addressing) is used. This method significantly increases the lifetime of OLEDs and makes them more attractive for high performance applications.

"OLEDs have many advantages, particularly in cars. The displays react immediately also at very low temperatures. Besides, dark pixels are really black and differ only slightly from the surroundings in the cockpit. This leads to an appearance more beautiful and more splendid", explains Chihao Xu. The driver chip from the CARO-project, realized by the Fraunhofer IPMS, is designed in such a versatile manner that also SQC can be implemented.

"Also with regard to cars, saving of energy is an important matter" says professor Xu. "Therefore it is consequent to research on the combination of this power-efficient driving scheme and the Summed-Equi-Line-Addressing and to develop a marketable demonstrator".

Now, the microelectronics group of Saarbrücken will together with Optrex Europe GmbH and further partners continue to push on the efficient control of passive matrix-OLED-displays, so that they can gain more interest especially in high-grade applications, like e.g. in cars.

The research association with the name CARO is one of the research associations, which is promoted within the scope of the initiative "OLED 2015" (phase 1), set up by the German Ministry for Education and Research in 2006. The participating CARO-partners thank the ministry for the financial assistance of the individual projects with the project codes 01BD 0680-0688; the project will expire in autumn.

For further information please contact:

Prof. Dr. Chihao Xu
Phone: +49 681/302-4305
chihao.xu@lme.uni-saarland.de
Universität des Saarlandes
Lehrstuhl für Mikroelektronik
Campus
66123 Saarbrücken
Dr. Jürgen Wahl
Phone: +49 6073 721 200
Juergen.Wahl@Optrex.de
Optrex Europe GmbH
Seligenstädter Str. 40
64832 Babenhausen
Ines Schedwill
Phone: +49 351 8823-238
info@ipms.fraunhofer.de
Fraunhofer-Institut für Photonische Mikrosysteme
Maria-Reiche-Str. 2
01109 Dresden

Irina Urig | idw
Further information:
http://www.lme.uni-saarland.de
http://www.optrex.de
http://www.ipms.fraunhofer.de

Further reports about: CARO-project OLED OLED-Display Optrex SQC digital camera organic material

More articles from Power and Electrical Engineering:

nachricht Supersonic waves may help electronics beat the heat
18.05.2018 | DOE/Oak Ridge National Laboratory

nachricht Researchers control the properties of graphene transistors using pressure
17.05.2018 | Columbia University

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

Im Focus: Dozens of binaries from Milky Way's globular clusters could be detectable by LISA

Next-generation gravitational wave detector in space will complement LIGO on Earth

The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...

Im Focus: Entangled atoms shine in unison

A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.

The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...

Im Focus: Computer-Designed Customized Regenerative Heart Valves

Cardiovascular tissue engineering aims to treat heart disease with prostheses that grow and regenerate. Now, researchers from the University of Zurich, the Technical University Eindhoven and the Charité Berlin have successfully implanted regenerative heart valves, designed with the aid of computer simulations, into sheep for the first time.

Producing living tissue or organs based on human cells is one of the main research fields in regenerative medicine. Tissue engineering, which involves growing...

Im Focus: Light-induced superconductivity under high pressure

A team of scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg investigated optically-induced superconductivity in the alkali-doped fulleride K3C60under high external pressures. This study allowed, on one hand, to uniquely assess the nature of the transient state as a superconducting phase. In addition, it unveiled the possibility to induce superconductivity in K3C60 at temperatures far above the -170 degrees Celsius hypothesized previously, and rather all the way to room temperature. The paper by Cantaluppi et al has been published in Nature Physics.

Unlike ordinary metals, superconductors have the unique capability of transporting electrical currents without any loss. Nowadays, their technological...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

 
Latest News

Supersonic waves may help electronics beat the heat

18.05.2018 | Power and Electrical Engineering

Keeping a Close Eye on Ice Loss

18.05.2018 | Information Technology

CrowdWater: An App for Flood Research

18.05.2018 | Information Technology

VideoLinks
Science & Research
Overview of more VideoLinks >>>