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
Researchers take next step toward fusion energy
16.11.2017 | Texas A&M University
Desert solar to fuel centuries of air travel
16.11.2017 | SolarPACES
The WHO reports an estimated 429,000 malaria deaths each year. The disease mostly affects tropical and subtropical regions and in particular the African continent. The Fraunhofer Institute for Silicate Research ISC teamed up with the Fraunhofer Institute for Molecular Biology and Applied Ecology IME and the Institute of Tropical Medicine at the University of Tübingen for a new test method to detect malaria parasites in blood. The idea of the research project “NanoFRET” is to develop a highly sensitive and reliable rapid diagnostic test so that patient treatment can begin as early as possible.
Malaria is caused by parasites transmitted by mosquito bite. The most dangerous form of malaria is malaria tropica. Left untreated, it is fatal in most cases....
The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.
Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...
Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.
That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...
Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.
During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....
The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.
Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...
15.11.2017 | Event News
15.11.2017 | Event News
30.10.2017 | Event News
21.11.2017 | Physics and Astronomy
21.11.2017 | Physics and Astronomy
21.11.2017 | Life Sciences