Researchers from Myongji University, Korea, have developed a way to improve liquid crystal displays (LCD), which could revolutionise display technology. Published today in the Institute of Physics journal Semiconductor Science and Technology, Professor Yong-Sang Kim and his team propose a new structure for polycrystalline silicon thin film transistors (poly-Si TFT), which makes them more reliable when used in active matrix liquid crystal displays (AMLCD), like those on lap top screens and television screens.
An AMLCD has a transistor for each pixel on the screen, which can be switched on or off. Currently, most AMLCDs use amorphous-silicon (a-Si) transistors. Poly-Si TFTs, however, have several advantages over a-Si TFTs, as they are thinner, lighter and can make higher resolution displays. The down side is that when applying poly-Si TFTs to AMLCDs, they leak much more current than the a-Si TFTs. A high leakage current can cause the colour and brightness of the image to change, rather than stay constant.
Previous methods of minimising the leakage current have led to a reduction of the ‘on-state’ current (which is the current flowing through the circuit when the transistor is switched on). This leads to a flickering screen, and reduces the performance of other parts of the circuit. Professor Kim’s goal has been to lower the leakage current without sacrificing the on-state current. The results published today show that using his new gate insulator structure in the poly-Si TFTs, he reduced the leakage current by three orders of magnitude, with no loss to the on-state current.
Michelle Cain | alfa
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Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.
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Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.
The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...
Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...
Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!
When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...
For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.
Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...
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