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
Energy hybrid: Battery meets super capacitor
01.12.2016 | Technische Universität Graz
Tailor-Made Membranes for the Environment
30.11.2016 | Forschungszentrum Jülich
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
Broadband rotational spectroscopy unravels structural reshaping of isolated molecules in the gas phase to accommodate water
In two recent publications in the Journal of Chemical Physics and in the Journal of Physical Chemistry Letters, researchers around Melanie Schnell from the Max...
The efficiency of power electronic systems is not solely dependent on electrical efficiency but also on weight, for example, in mobile systems. When the weight of relevant components and devices in airplanes, for instance, is reduced, fuel savings can be achieved and correspondingly greenhouse gas emissions decreased. New materials and components based on gallium nitride (GaN) can help to reduce weight and increase the efficiency. With these new materials, power electronic switches can be operated at higher switching frequency, resulting in higher power density and lower material costs.
Researchers at the Fraunhofer Institute for Solar Energy Systems ISE together with partners have investigated how these materials can be used to make power...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
02.12.2016 | Medical Engineering
02.12.2016 | Agricultural and Forestry Science
02.12.2016 | Physics and Astronomy